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let g of x equal cosine of x . so let 's actually graph that . so that would be the graph right over there . i drew it ahead of time . so this is a segment of cosine of x between x is equal to 0 and x equals pi . obviously , it keeps on going in both directions after that . and then they ask us , what is the limit as h... | obviously , it keeps on going in both directions after that . and then they ask us , what is the limit as h approaches 0 of g of pi plus h minus g of pi over h ? so let 's just think about it a little bit . | i was able to simplify* the equation to the limit as h -- > 0 of 1-cos ( h ) -- -- -- -- h any advice on how to proceed from here ? |
let g of x equal cosine of x . so let 's actually graph that . so that would be the graph right over there . i drew it ahead of time . so this is a segment of cosine of x between x is equal to 0 and x equals pi . obviously , it keeps on going in both directions after that . and then they ask us , what is the limit as h... | this point is going to go further and further and further to the left . so pi plus h , as h approaches 0 , is going to approach pi . if we assumed h was a negative value , then we would be approaching from here . | how is the limit as h approaches 0 another 0 instead of undefined ? |
let g of x equal cosine of x . so let 's actually graph that . so that would be the graph right over there . i drew it ahead of time . so this is a segment of cosine of x between x is equal to 0 and x equals pi . obviously , it keeps on going in both directions after that . and then they ask us , what is the limit as h... | but what is going to happen as h becomes smaller and smaller and smaller ? well , the point pi plus h , g of pi plus h is going to get closer and closer to this point . and the slope of those secant lines -- i know it 's hard to see , because it 's small here -- they 're going to start getting closer and closer to the ... | what is the point of knowing the slop of the equation ? |
let g of x equal cosine of x . so let 's actually graph that . so that would be the graph right over there . i drew it ahead of time . so this is a segment of cosine of x between x is equal to 0 and x equals pi . obviously , it keeps on going in both directions after that . and then they ask us , what is the limit as h... | well , what does that look like ? well the slope of the tangent line , we 're at a minimum point at x equals pi right over here . cosine of pi we know is a negative 1 . | can we always assume that the limit equation has not been simplified and represents a point-slope form ? |
let g of x equal cosine of x . so let 's actually graph that . so that would be the graph right over there . i drew it ahead of time . so this is a segment of cosine of x between x is equal to 0 and x equals pi . obviously , it keeps on going in both directions after that . and then they ask us , what is the limit as h... | so let 's actually graph that . so that would be the graph right over there . i drew it ahead of time . | how would i know that i need to use sin , cos , or tan and which is appropriate ? |
let g of x equal cosine of x . so let 's actually graph that . so that would be the graph right over there . i drew it ahead of time . so this is a segment of cosine of x between x is equal to 0 and x equals pi . obviously , it keeps on going in both directions after that . and then they ask us , what is the limit as h... | so this is just my previous answer divided by 0.1 . so i get 0.04 . now let me make h even smaller . | how did sal get zero for as the limit ? |
let g of x equal cosine of x . so let 's actually graph that . so that would be the graph right over there . i drew it ahead of time . so this is a segment of cosine of x between x is equal to 0 and x equals pi . obviously , it keeps on going in both directions after that . and then they ask us , what is the limit as h... | this point is going to go further and further and further to the left . so pi plus h , as h approaches 0 , is going to approach pi . if we assumed h was a negative value , then we would be approaching from here . | there was an expression that mentioned the limit of h- > 0 , and i was wondering -- if h was 0 , then the whole expression would be infinity , and not undefined , right ? |
let g of x equal cosine of x . so let 's actually graph that . so that would be the graph right over there . i drew it ahead of time . so this is a segment of cosine of x between x is equal to 0 and x equals pi . obviously , it keeps on going in both directions after that . and then they ask us , what is the limit as h... | i drew it ahead of time . so this is a segment of cosine of x between x is equal to 0 and x equals pi . obviously , it keeps on going in both directions after that . | so if the slope is equal to 0 here , the function of this slope at x=pi is written y=-1 ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | is n't the immune cell supposed to get rid of the viruses , not make more ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i do n't want to offend the chemists and the physicists out there . i actually find those quite fascinating as well . but we 're going to answer , or attempt to start to answer , some of the most fundamental questions of our existence . | how does cell division actually create new cells from just splitting ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | you know , this right here is a molecule of dna . how do we start with things like that , and we get the complexity of living things ? and you might be saying , well , what makes something living ? | but virus do n't have cell structures and virus are living things ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and perhaps most importantly , dna and its role in reproduction and containing information . and we 're going to study cells , which are the basic building block of life . and as we 'll see , even though we view cells as these super , super small , small things , cells in and of themselves are incredibly complex . and ... | how do cells come from other cells ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | how do they do this ? you know , we look around us . how do we , you know , eat a muffin ? | does anyone know what the spleen does in the human body ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i 'm talking about bacteria . and it really is fascinating . how do we start off with inanimate molecules and atoms ? | are we really `` alive '' if we are made up of inanimate material ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | are tympanum and ear drum same ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | you know , this right here is a molecule of dna . how do we start with things like that , and we get the complexity of living things ? and you might be saying , well , what makes something living ? | how did living things come to life ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | how do the hiv viruses emerge from the immune cells ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i 'm talking about plants . i 'm talking about bacteria . and it really is fascinating . | life began with bacteria , then , is the life evolving still from bacteria to complex-structured human ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | what is the purpose of bio- engineering ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | what happens when a lysosome burst inside the cell and all its enzymes are released in the cytoplasm ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | how do we start with things like that , and we get the complexity of living things ? and you might be saying , well , what makes something living ? well , living things convert energy from one form to another . | what exactly makes up a virus ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | why can not we hear sound more than 20000 hz ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and we will study that as we look at evolution and natural selection . so welcome to khan academy 's biology section . i think you 're going to find it fascinating . | what do you mean when you assert that biology is `` based '' ... .. on mathematics ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | they definitely reproduce , and they definitely evolve . but they do n't necessarily have a metabolism . we 'll learn a lot more about that . | is n't mathematics simply a tool ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | or are you claiming that mathematical entities have an ontological status ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | they use that energy to change . and i guess growth is a form of change . they use that energy to reproduce . | is growth a result of metabolism in organisms ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and we will study that as we look at evolution and natural selection . so welcome to khan academy 's biology section . i think you 're going to find it fascinating . | why is mathematics a part of biology ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | they use that energy to grow . they use that energy to change . and i guess growth is a form of change . | what does sal mean by change ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and then perhaps one of the biggest questions of all is how did life come about ? and we will study that as we look at evolution and natural selection . so welcome to khan academy 's biology section . i think you 're going to find it fascinating . | what is the importance of biology with evolution ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | they use that energy to change . and i guess growth is a form of change . they use that energy to reproduce . | what is the full form of dna ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about plants . | why did animals adapt to land ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | they use that energy to change . and i guess growth is a form of change . they use that energy to reproduce . | what is the full form of dna ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i 'm talking about bacteria . and it really is fascinating . how do we start off with inanimate molecules and atoms ? | how does dna and rna really work ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | and how is rna replicated ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and you might be saying , well , what makes something living ? well , living things convert energy from one form to another . they use that energy to grow . | how do we convert energy from one place to another ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . | is it true that there are 23 chromosomes in the human body ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | what does hiv stand for ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | what does a hiv virus do to your body ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | how do we start off with inanimate molecules and atoms ? you know , this right here is a molecule of dna . how do we start with things like that , and we get the complexity of living things ? | what does dna stand for ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i do n't want to offend the chemists and the physicists out there . i actually find those quite fascinating as well . but we 're going to answer , or attempt to start to answer , some of the most fundamental questions of our existence . | is it actually true that we share 50 % of our dna with the banana ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | even with the bacteria that you can only even see at a microscopic level . in fact , we have so much bacteria as part of what makes us , us . so these are fascinating questions . | how much curve are on roots in the ground of trees ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | why is a double helix called a double helix ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | so even though you imagine cells as these very , very small microscopic things , this incredible complexity . even viruses . viruses are one of these fascinating things that kind of are right on the edge between life and nonlife . | is viruses even consider living or nonliving cause i always hear mixed opinions and their based on having a nucleus or something like that ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | so even though you imagine cells as these very , very small microscopic things , this incredible complexity . even viruses . viruses are one of these fascinating things that kind of are right on the edge between life and nonlife . | can someone explain in depth about the way viruses work ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | how big can a single cell become ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | how do we start off with inanimate molecules and atoms ? you know , this right here is a molecule of dna . how do we start with things like that , and we get the complexity of living things ? | what does dna stand for ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | pm , how do germs infect your body ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | is your dna in every cell in your body ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . | how can biology be the study of life if life has no physical charecteristics ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | you know , this right here is a molecule of dna . how do we start with things like that , and we get the complexity of living things ? and you might be saying , well , what makes something living ? | would n't biology be the study of living things ( organisms ) ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | how do we start off with inanimate molecules and atoms ? you know , this right here is a molecule of dna . how do we start with things like that , and we get the complexity of living things ? | dna can be changed among differente species ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | you know , this right here is a molecule of dna . how do we start with things like that , and we get the complexity of living things ? and you might be saying , well , what makes something living ? well , living things convert energy from one form to another . they use that energy to grow . | how can a virus be non-living and living at the same time ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | what two taxonomic domains are divided based on the presence , or absence , of peptidoglycan ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . | is metabolism a really fundamental qualification for classifying which is life and which is not ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | are there any differences between a cell and a virus besides metabolism ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i 'm talking about plants . i 'm talking about bacteria . and it really is fascinating . | is bacteria found in insects ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and so over the course of what you see in biology on khan academy , we 're going to answer these fundamental , fascinating questions . we 're going to think about things like energy and the role of energy in life . we 're going to thing about important molecules in biology . | do all life forms need energy ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and so over the course of what you see in biology on khan academy , we 're going to answer these fundamental , fascinating questions . we 're going to think about things like energy and the role of energy in life . we 're going to thing about important molecules in biology . | what does biology have in energy ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | how do we start off with inanimate molecules and atoms ? you know , this right here is a molecule of dna . how do we start with things like that , and we get the complexity of living things ? | if combine the rna of a virus and the dna of a human , what will we get ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | how do they do this ? you know , we look around us . how do we , you know , eat a muffin ? | do anyone know how to memorize the difference between meiosis and mitosis ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | how big is our diaphragm ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and you might be saying , well , what makes something living ? well , living things convert energy from one form to another . they use that energy to grow . | what types of energy do humans convert ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | which is the longest cell in our body ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i do n't want to offend the chemists and the physicists out there . i actually find those quite fascinating as well . but we 're going to answer , or attempt to start to answer , some of the most fundamental questions of our existence . | how does cell division actually create new cells from just splitting ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | what is the tough membrane that encloses the heart ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and perhaps most importantly , dna and its role in reproduction and containing information . and we 're going to study cells , which are the basic building block of life . and as we 'll see , even though we view cells as these super , super small , small things , cells in and of themselves are incredibly complex . | what is the study of death cells ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | what is speciation in different environments ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | you know , this right here is a molecule of dna . how do we start with things like that , and we get the complexity of living things ? and you might be saying , well , what makes something living ? well , living things convert energy from one form to another . they use that energy to grow . | is a virus living or non-living ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and as we 'll see , even though we view cells as these super , super small , small things , cells in and of themselves are incredibly complex . and if you compare them to an atomic scale , they 're quite large . in fact , this entire blue background that i have there , that 's the surface of an immune cell . | also is there a smaller scale than the atomic scale ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and perhaps most importantly , dna and its role in reproduction and containing information . and we 're going to study cells , which are the basic building block of life . and as we 'll see , even though we view cells as these super , super small , small things , cells in and of themselves are incredibly complex . and ... | what are the cells made of if we are made of cells ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | so these are fascinating questions . how did life even emerge ? and so over the course of what you see in biology on khan academy , we 're going to answer these fundamental , fascinating questions . | what makes life difficult to handle ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | what was the cambrian explosion ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about plants . | but why is it considered in the group of protozoa which comes under animals ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | well , living things convert energy from one form to another . they use that energy to grow . they use that energy to change . | according to the comments , a living thing is classified as something that has the ability to grow , reproduce , take in and use energy , excrete waste and respond to the environment , but what type of waste is produced by plants , and how was this decided by scientists to be considered the truth ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | we 're going to thing about important molecules in biology . and perhaps most importantly , dna and its role in reproduction and containing information . and we 're going to study cells , which are the basic building block of life . and as we 'll see , even though we view cells as these super , super small , small thin... | is it possible for dna to make cancer cells ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and as we 'll see , even though we view cells as these super , super small , small things , cells in and of themselves are incredibly complex . and if you compare them to an atomic scale , they 're quite large . in fact , this entire blue background that i have there , that 's the surface of an immune cell . | how does glycogen compare with starch ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and it really is fascinating . how do we start off with inanimate molecules and atoms ? you know , this right here is a molecule of dna . | can we have genetic similarity between inanimate objects like a wooden desk or glass or ice cream ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | so these are fascinating questions . how did life even emerge ? and so over the course of what you see in biology on khan academy , we 're going to answer these fundamental , fascinating questions . | how do muffins have to do with life ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | we 'll learn a lot more about that . they do n't necessarily use energy and growth in the same way that we would associate with life . and then perhaps one of the biggest questions of all is how did life come about ? | based on the definition of life , would n't fire be living , too ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | how do they do this ? you know , we look around us . how do we , you know , eat a muffin ? | is life all around us ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | how are virus facinating ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | we 're going to thing about important molecules in biology . and perhaps most importantly , dna and its role in reproduction and containing information . and we 're going to study cells , which are the basic building block of life . and as we 'll see , even though we view cells as these super , super small , small thin... | what makes up dna cells ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | where did the energy from that muffin come from ? how are we similar to a plant or an insect ? and we are eerily or strangely similar to these things . | is it possible for any mammal in the planet to have a similar gene structure to homo sapiens ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and we will study that as we look at evolution and natural selection . so welcome to khan academy 's biology section . i think you 're going to find it fascinating . | what is the relationship between medicine and biology ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and we will study that as we look at evolution and natural selection . so welcome to khan academy 's biology section . i think you 're going to find it fascinating . | is medicine more importante than biology ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and perhaps most importantly , dna and its role in reproduction and containing information . and we 're going to study cells , which are the basic building block of life . and as we 'll see , even though we view cells as these super , super small , small things , cells in and of themselves are incredibly complex . and ... | how many types of cells are there and what do they do in our body ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | so these are fascinating questions . how did life even emerge ? and so over the course of what you see in biology on khan academy , we 're going to answer these fundamental , fascinating questions . | at about 0 , bacteria is between life and non-life , what would you call non-life ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | in fact , this entire blue background that i have there , that 's the surface of an immune cell . and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . | if e get heart why cant we see are c2 ceels ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | why from the immune cell was the hiv emerging from that cell ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | so these are fascinating questions . how did life even emerge ? and so over the course of what you see in biology on khan academy , we 're going to answer these fundamental , fascinating questions . | how is virus `` at the edge of life and non-life '' ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | so even though you imagine cells as these very , very small microscopic things , this incredible complexity . even viruses . viruses are one of these fascinating things that kind of are right on the edge between life and nonlife . | is viruses alive or not ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | what does hiv stand for ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and perhaps most importantly , dna and its role in reproduction and containing information . and we 're going to study cells , which are the basic building block of life . and as we 'll see , even though we view cells as these super , super small , small things , cells in and of themselves are incredibly complex . and ... | so everything living is made of cells ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and so over the course of what you see in biology on khan academy , we 're going to answer these fundamental , fascinating questions . we 're going to think about things like energy and the role of energy in life . we 're going to thing about important molecules in biology . | when we eat , how does energy in food ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | is there any known evidence of what started the chain reaction that eventually developed into humans ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | and what you see here emerging from it , these little yellow things . these are hiv viruses , emerging from an immune cell . so even though you imagine cells as these very , very small microscopic things , this incredible complexity . | what was the first thing that developed into a cell ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | how would you know how many egg cells would there be in a human for three days ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . | what are 3 types of organ systems ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | so these are fascinating questions . how did life even emerge ? and so over the course of what you see in biology on khan academy , we 're going to answer these fundamental , fascinating questions . | how does the life cycle work ? |
i would like to welcome you to biology at khan academy . and biology , as you might now , is the study of life . and i ca n't really imagine anything more interesting than the study of life . and when i say `` life , '' i 'm not just talking about us , human beings . i 'm talking about all animals . i 'm talking about... | you know , this right here is a molecule of dna . how do we start with things like that , and we get the complexity of living things ? and you might be saying , well , what makes something living ? well , living things convert energy from one form to another . they use that energy to grow . | why is it difficult to classify some objects as living or nonliving ? |
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