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selective breeding is when an organism receives selective genetic traits from its parents by human design
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human are breeding german shepherd dogs to other smaller dogs
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smaller dogs have genetic trait of smaller size
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siberian tigers only have female tigers in the species
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if all members of a species cannot produce offspring then that species will likely become extinct
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two females cannot usually reproduce with each other
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sexual reproduction is a source of genetic variatio in offspring
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genetic variation in offspring has a positive impact on an offspring 's survival
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asexual reproduction is not a source of genetic variation in offspring
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reproduction produces / produce offspring
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sexual reproduction is a kind of reproduction
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genes are a kind of genetic material
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offspring receive genes from their parents through sexual reproduction
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preventing reproduction decreases the rate of reproduction
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sexual reproduction requires both sperm and egg
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if something required for a process is not produced then that process is prevented from occurring
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the sperm production is prevented in male insects
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sexual reproduction is a kind of reproduction
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as the rate of reproduction decreases , the population will decrease
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a flower produces seeds
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seeds are produced in the stage of pollination in plants reproduction
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pollination is the fertilization stage in plants reproduction
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fertilization is a stage in the sexual reproduction process
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genetic variation in offspring has a positive impact on an offspring 's survival
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sexual reproduction is a source of genetic variatio in offspring
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asexual reproduction is not a source of genetic variation in offspring
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genes are able to determine the inherited characteristics of a living thing
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a son is a kind of male offspring
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offspring receives half of the genes from each parent
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a father is a kind of male parent
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a mother is a kind of female parent
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fire is a kind of chemical reaction
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chemical reactions cause new substances to form
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fire causes burning
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the candle is burning
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kim's hammer is flaky on the surface
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a hammer often is made of metal
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rust forming is a kind of chemical change
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when a metal rusts , that metal becomes flaky on the surface
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different substances have different chemical properties
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a corn is a kind of object
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chemical reactions cause different substances to form
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popping popcorn requires adding heat to the corns
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adding heat to an object sometimes causes chemical reactions
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chemical change is a kind of chemical reaction
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fire is a kind of chemical reaction
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lighting a candle causes that candle to burn
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fire causes burning
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chemical reactions cause chemical change
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fire is a kind of chemical reaction
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a leaf is a kind of object
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fire causes burning on objects
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baking is a kind of cooking
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cooking food requires adding heat energy to the food
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the dough is baked to form the crust of a pizza
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chemical reactions cause chemical change
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adding heat to food usually causes chemical reaction
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element 3 turns to a greenish color
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an element is a kind of substance
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if the color of a substance changes then a chemical change may have occurred
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a car fender is sometimes made of metal
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metal rusts
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rust forming is a kind of chemical change
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metal in contact with water and oxygen will rust
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air contains oxygen and water vapor
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the metal on the roof of a car is exposed to air
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if something is exposed to air, then that something is in contact with air
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oxygen is a kind of element
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a compound is made of two or more elements chemically combined
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water is made of hydrogen and oxygen chemically combined
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hydrogen is a kind of element
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when two substances together form a compound then those substances cannot be physically separated
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the new substance cannot be physically separated
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a new substance glycogen is produced in the conversion
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chemical reactions cause new substances to form
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chemical reactions cause different substances to form
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batter and cake are different substances
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burning a match will produce ashes
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match and ashes are different substances
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lighting a match causes that match to burn
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baking a cake turns batter into a cake
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chemical reactions cause chemical change
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iron is a kind of metal
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rust forming is a kind of chemical change
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nails are often made of iron
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metals in contact with water and oxygen will rust
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magnesium is a kind of substance
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a lit candle is a source of fire
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chemical reactions cause chemical change
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fire is a kind of chemical reaction
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fire causes burning
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sodium is a kind of element
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a compound is made of two or more elements chemically combined
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sodium chloride is always made of chemically combined chlorine and sodium
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chlorine is a kind of element
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wood burns
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wood chips are made of wood
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fire is a kind of chemical reaction
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chemical reactions cause chemical change
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fire causes burning
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