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[ { "content": "Answer the following question given this paragraph: \n\nMesophiles grow best in moderate temperature, typically between 25°C and 40°C (77°F and 104°F). Mesophiles are often found living in or on the bodies of humans or other animals. The optimal growth temperature of many pathogenic mesophiles is ...
[ { "content": "Answer the following question given this paragraph: \n\nWithout Coriolis Effect the global winds would blow north to south or south to north. But Coriolis makes them blow northeast to southwest or the reverse in the Northern Hemisphere. The winds blow northwest to southeast or the reverse in the s...
[ { "content": "Answer the following question given this paragraph: \n\nSummary Changes of state are examples of phase changes, or phase transitions. All phase changes are accompanied by changes in the energy of a system. Changes from a more-ordered state to a less-ordered state (such as a liquid to a gas) areend...
[ { "content": "Answer the following question given this paragraph: \n\nAll radioactive decay is dangerous to living things, but alpha decay is the least dangerous.\n\n\nQ: What is the least dangerous radioactive decay?\n\n\nA:", "role": "user" }, { "content": "alpha decay", "role": "assistant" ...
[ { "content": "Answer the following question given this paragraph: \n\nExample 3.5 Calculating Projectile Motion: Hot Rock Projectile Kilauea in Hawaii is the world’s most continuously active volcano. Very active volcanoes characteristically eject red-hot rocks and lava rather than smoke and ash. Suppose a large...
[ { "content": "Answer the following question given this paragraph: \n\nMeteoroids are smaller than asteroids, ranging from the size of boulders to the size of sand grains. When meteoroids enter Earth’s atmosphere, they vaporize, creating a trail of glowing gas called a meteor. If any of the meteoroid reaches Ear...
[ { "content": "Answer the following question given this paragraph: \n\nA combustion reaction occurs when a substance reacts quickly with oxygen (O 2 ). For example, in the Figure below , charcoal is combining with oxygen. Combustion is commonly called burning, and the substance that burns is usually referred to ...
[ { "content": "Answer the following question given this paragraph: \n\nRing species Ring species demonstrate a version of allopatric speciation. Imagine populations of the species A. Over the geographic range of A there exist a number of subpopulations. These subpopulations (A1 to A5) and (Aa to Ae) have limited...
[ { "content": "Answer the following question given this paragraph: \n\nOne type of radioactivity is alpha emission. What is an alpha particle? What happens to an alpha particle after it is emitted from an unstable nucleus?.\n\n\nQ: Alpha emission is a type of what?\n\n\nA:", "role": "user" }, { "cont...
[ { "content": "Answer the following question given this paragraph: \n\nThe stored food in a seed is called endosperm . It nourishes the embryo until it can start making food on its own.\n\n\nQ: What is the stored food in a seed called?\n\n\nA:", "role": "user" }, { "content": "endosperm", "role":...
[ { "content": "Answer the following question given this paragraph: \n\nOne way to keep iron from corroding is to keep it painted. The layer of paint prevents the water and oxygen necessary for rust formation from coming into contact with the iron. As long as the paint remains intact, the iron is protected from c...
[ { "content": "Answer the following question given this paragraph: \n\nMost animal behaviors are controlled by both genes and experiences in a given environment.\n\n\nQ: What is controlled by both genes and experiences in a given envionment?\n\n\nA:", "role": "user" }, { "content": "animal behaviors"...
[ { "content": "Answer the following question given this paragraph: \n\nThe information listed at the right of the label tells you what to look for. At the top of the label, look for the serving size. The serving size tells you how much of the food you should eat to get the nutrients listed on the label. A cup of...
[ { "content": "Answer the following question given this paragraph: \n\nNuclear symbols are used to write nuclear equations for radioactive decay. Let’s consider the example of the beta-minus decay of thorium-234 to protactinium-234. This reaction is represented by the equation:.\n\n\nQ: What are used to write nu...
[ { "content": "Answer the following question given this paragraph: \n\nGene transcription is controlled by regulatory proteins that bind to regulatory elements on DNA. The proteins usually either activate or repress transcription.\n\n\nQ: What is controlled by regulatory proteins that bind to regulatory elements...
[ { "content": "Answer the following question given this paragraph: \n\nOccurrence, Preparation, and Compounds of Boron and Silicon Boron constitutes less than 0.001% by weight of the earth’s crust. In nature, it only occurs in compounds with oxygen. Boron is widely distributed in volcanic regions as boric acid, ...
[ { "content": "Answer the following question given this paragraph: \n\n42.1 Circulatory systems link exchange surfaces with cells throughout the body.\n\n\nQ: What organ systems link exchange surfaces with cells throughout the body?\n\n\nA:", "role": "user" }, { "content": "circulatory", "role": ...
[ { "content": "Answer the following question given this paragraph: \n\nAn allergy occurs when the immune system attacks a harmless substance that enters the body from the outside. A substance that causes an allergy is called an allergen. It is the immune system, not the allergen, that causes the symptoms of an a...
[ { "content": "Answer the following question given this paragraph: \n\nFertilization is the union of a sperm and egg, resulting in the formation of a zygote.\n\n\nQ: Fertilization is the union of a sperm and egg, resulting in the formation of what?\n\n\nA:", "role": "user" }, { "content": "a zygote",...
[ { "content": "Answer the following question given this paragraph: \n\nAll plants have a characteristic life cycle that includes alternation of generations . Plants alternate between haploid and diploid generations. Alternation of generations allows for both asexual and sexual reproduction. Asexual reproduction ...
[ { "content": "Answer the following question given this paragraph: \n\nEnzymes are critical to the body’s healthy functioning. They assist, for example, with the breakdown of food and its conversion to energy. In fact, most of the chemical reactions in the body are facilitated by enzymes.\n\n\nQ: Most of the che...
[ { "content": "Answer the following question given this paragraph: \n\n\n\n\nQ: What is the termination of a pregnancy in progress called?\n\n\nA:", "role": "user" }, { "content": "abortion", "role": "assistant" } ]
[ { "content": "Answer the following question given this paragraph: \n\nCutting down on the use of chemical fertilizers is one way to prevent dead zones in bodies of water. Preserving wetlands is also important. Wetlands are habitats such as swamps, marshes, and bogs where the ground is soggy or covered with wate...
[ { "content": "Answer the following question given this paragraph: \n\nIntrinsic Muscles of the Hand The intrinsic muscles of the hand both originate and insert within it (Figure 11.28). These muscles allow your fingers to also make precise movements for actions, such as typing or writing. These muscles are divi...
[ { "content": "Answer the following question given this paragraph: \n\nUsually, testing a hypothesis requires making observations or performing experiments. In this case, we will look into existing scientific literature to see if either of these hypotheses can be disproved, or if one or both can be supported by ...
[ { "content": "Answer the following question given this paragraph: \n\nany other electron, they become a part of the molecule’s electron system.204 This sharing of electrons produces what is known as a covalent bond. Covalent bonds are ~20 to 50 times stronger than van der Waals interactions. What exactly does t...
[ { "content": "Answer the following question given this paragraph: \n\nWater molecules move about continuously due to their kinetic energy. When a crystal of sodium chloride is placed into water, the water’s molecules collide with the crystal lattice. Recall that the crystal lattice is composed of alternating po...
[ { "content": "Answer the following question given this paragraph: \n\nGeologic maps display rock units and geologic features. A small scale map displays individual rock units while a large scale map shows geologic provinces.\n\n\nQ: A small scale version of what type of map displays individual rock units?\n\n\n...
[ { "content": "Answer the following question given this paragraph: \n\nOne idea is that evolution happens. Evolution is a change in the inherited traits of organisms over time. Living things have changed as descendants diverged from common ancestors in the past.\n\n\nQ: What is defined as a change in the inherit...
[ { "content": "Answer the following question given this paragraph: \n\nWhat causes puberty to begin? The hypothalamus in the brain “tells” the pituitary gland to secrete hormones that target the testes. The main pituitary hormone involved is luteinizing hormone (LH) . It stimulates the testes to secrete testoste...
[ { "content": "Answer the following question given this paragraph: \n\nSeed plants called angiosperms produce seeds in the ovaries of flowers.\n\n\nQ: Where do angiosperms produce seeds in flowers?\n\n\nA:", "role": "user" }, { "content": "ovaries", "role": "assistant" } ]
[ { "content": "Answer the following question given this paragraph: \n\nPhotosynthetic protists use light energy to make food. They are major producers in aquatic ecosystems.\n\n\nQ: In order to create food, what do photosynthetic protists use?\n\n\nA:", "role": "user" }, { "content": "light energy", ...
[ { "content": "Answer the following question given this paragraph: \n\nBirds are endothermic tetrapod vertebrates. They are bipedal, which means they walk on two legs. Birds also lay amniotic eggs, and the eggs have hard, calcium carbonate shells. Although birds are the most recent class of vertebrates to evolve...
[ { "content": "Answer the following question given this paragraph: \n\nAn ionic compound contains positive and negative ions.\n\n\nQ: What type of ions do ionic compounds contain?\n\n\nA:", "role": "user" }, { "content": "positive and negative", "role": "assistant" } ]
[ { "content": "Answer the following question given this paragraph: \n\n\n\n\nQ: All living things need air and this to survive?\n\n\nA:", "role": "user" }, { "content": "water", "role": "assistant" } ]
[ { "content": "Answer the following question given this paragraph: \n\nSome Eukarya are also single-celled, but many are multicellular. Some have a cell wall; others do not. However, the cells of all Eukarya have a nucleus and other organelles.\n\n\nQ: The cells of all eukarya have a what?\n\n\nA:", "role": ...
[ { "content": "Answer the following question given this paragraph: \n\nDivergent plate boundaries produce huge mountain ranges under water in every ocean basin.\n\n\nQ: What type of plate boundaries produce huge mountain ranges in the ocean basin?\n\n\nA:", "role": "user" }, { "content": "divergent",...
[ { "content": "Answer the following question given this paragraph: \n\ntemperatures with electropositive metals such as those of groups 1 and 2 and aluminum produces ionic carbides, which contain discrete metal cations and carbon anions. The identity of the anions depends on the size of the second element. For e...
[ { "content": "Answer the following question given this paragraph: \n\nAgents of Decomposition The fungus-like protist saprobes are specialized to absorb nutrients from nonliving organic matter, such as dead organisms or their wastes. For instance, many types of oomycetes grow on dead animals or algae. Saprobic ...
[ { "content": "Answer the following question given this paragraph: \n\nRibosomes are small organelles and are the sites of protein synthesis (or assembly). They are made of ribosomal protein and ribosomal RNA, and are found in both eukaryotic and prokaryotic cells. Unlike other organelles, ribosomes are not surr...
[ { "content": "Answer the following question given this paragraph: \n\nMeiosis I begins after DNA replicates during interphase of the cell cycle. In both meiosis I and meiosis II , cells go through the same four phases as mitosis - prophase, metaphase, anaphase and telophase. However, there are important differe...
[ { "content": "Answer the following question given this paragraph: \n\nEarthquakes are primarily the result of plate tectonic motions. What type of stress would cause earthquakes at each of the three types of plate boundaries?.\n\n\nQ: What phenomenon is primarily the result of plate tectonic motions?\n\n\nA:", ...
[ { "content": "Answer the following question given this paragraph: \n\nGanglia A ganglion is a group of neuron cell bodies in the periphery. Ganglia can be categorized, for the most part, as either sensory ganglia or autonomic ganglia, referring to their primary functions. The most common type of sensory ganglio...
[ { "content": "Answer the following question given this paragraph: \n\n\n\n\nQ: Where does most of our food come from?\n\n\nA:", "role": "user" }, { "content": "angiosperms", "role": "assistant" } ]
[ { "content": "Answer the following question given this paragraph: \n\nUnder what conditions then, do gases behave least ideally? When a gas is put under high pressure, its molecules are forced closer together as the empty space between the particles is diminished. A decrease in the empty space means that the as...
[ { "content": "Answer the following question given this paragraph: \n\nEach type of rock weathers in its own way. Certain types of rock are very resistant to weathering. Igneous rocks tend to weather slowly because they are hard. Water cannot easily penetrate them. Granite is a very stable igneous rock. Other ty...
[ { "content": "Answer the following question given this paragraph: \n\nSkeletal system problems include osteoporosis, bone fractures, and ligament sprains. A diet rick in calcium and vitamin D may reduce the risk of osteoporosis and related bone fractures. Following safe practices may also reduce the risk of fra...
[ { "content": "Answer the following question given this paragraph: \n\nAir pollution is harmful to human beings and other living things. About 22 million people die from air pollution each year. Breathing polluted air increases the risk of developing lung diseases such as asthma and lung cancer. Breathing bad ai...
[ { "content": "Answer the following question given this paragraph: \n\nEnzymes are involved in most of the biochemical reactions that take place in organisms. About 4,000 such reactions are known to be catalyzed by enzymes, but the number may be even higher. Enzymes allow reactions to occur at the rate necessary...
[ { "content": "Answer the following question given this paragraph: \n\nThe metals of group 13 (Al, Ga, In, and Tl) are all reactive. However, passivation occurs as a tough, hard, thin film of the metal oxide forms upon exposure to air. Disruption of this film may counter the passivation, allowing the metal to re...
[ { "content": "Answer the following question given this paragraph: \n\nautomobile axle drives a wheel, which has a much larger diameter than the axle. The MA is less than 1. (c) An ordinary pulley is used to lift a heavy load. The pulley changes the direction of the force T exerted by the cord without changing i...
[ { "content": "Answer the following question given this paragraph: \n\nFigure 14.3 The Tongue The tongue is covered with small bumps, called papillae, which contain taste buds that are sensitive to chemicals in ingested food or drink. Different types of papillae are found in different regions of the tongue. The ...
[ { "content": "Answer the following question given this paragraph: \n\nWhat if you were to drop a bowling ball and a soccer ball at the same time from the same distance above the ground? The bowling ball has greater mass than the basketball, so the pull of gravity on it is greater. Would it fall to the ground fa...
[ { "content": "Answer the following question given this paragraph: \n\nThe plasma membrane forms a barrier between the cytoplasm inside the cell and the environment outside the cell. It protects and supports the cell and also controls everything that enters and leaves the cell. It allows only certain substances ...
[ { "content": "Answer the following question given this paragraph: \n\nA pile of leaves slowly rots in the backyard. In the presence of oxygen, hydrogen can interact to make water. Gold can be stretched into very thin wires.\n\n\nQ: In the presence of oxygen, hydrogen can interact to make what?\n\n\nA:", "ro...
[ { "content": "Answer the following question given this paragraph: \n\nCompared to Earth, the solar system is a big place. But galaxies are bigger - a lot bigger. A galaxy is a very large group of stars held together by gravity. How enormous a galaxy is and how many stars it contains are impossible for us to rea...
[ { "content": "Answer the following question given this paragraph: \n\nThe angle at which light bends when it enters a different medium depends on its change in speed. The greater the change in speed, the greater the angle of refraction is. For example, light refracts more when it passes from air to diamond than...
[ { "content": "Answer the following question given this paragraph: \n\nThe Energy Cycle Whether the organism is a bacterium, plant, or animal, all living things access energy by breaking down carbohydrate molecules. But if plants make carbohydrate molecules, why would they need to break them down, especially whe...
[ { "content": "Answer the following question given this paragraph: \n\nIncreasing the temperature increases the average kinetic energy of the N2molecules.\n\n\nQ: Increasing the temperature of n2 molecules increases what energy of motion?\n\n\nA:", "role": "user" }, { "content": "kinetic energy", ...
[ { "content": "Answer the following question given this paragraph: \n\nFM radio is inherently less subject to noise from stray radio sources than AM radio. The reason is that amplitudes of waves add. So an AM receiver would interpret noise added onto the amplitude of its carrier wave as part of the information. ...
[ { "content": "Answer the following question given this paragraph: \n\nFigure 8.11 The sun emits energy in the form of electromagnetic radiation. This radiation exists at different wavelengths, each of which has its own characteristic energy. All electromagnetic radiation, including visible light, is characteriz...
[ { "content": "Answer the following question given this paragraph: \n\nThe core is the Sun's innermost layer. The core is plasma. It has a temperature of around 15 million degrees Celsius (C). Nuclear fusion reactions create the immense temperature. In these reactions, hydrogen atoms fuse to form helium. This re...
[ { "content": "Answer the following question given this paragraph: \n\nTo grow and develop, you must form new cells. Imagine how often your cells must divide during a growth spurt. Growing just an inch requires countless cell divisions. Your body must produce new bone cells, new skin cells, new cells in your blo...
[ { "content": "Answer the following question given this paragraph: \n\nThe pioneer species is soon replaced by other populations. Abiotic factors such as soil quality, water, and climate will determine the species that continue the process of succession. Mosses and grasses will be able to grow in the newly creat...
[ { "content": "Answer the following question given this paragraph: \n\n\n\n\nQ: Fungi may form mutualistic relationships with plants, algae, cyanobacteria, and what?\n\n\nA:", "role": "user" }, { "content": "animals", "role": "assistant" } ]
[ { "content": "Answer the following question given this paragraph: \n\nMariana Ruiz Villarreal (LadyofHats) for CK-12 Foundation. The nitrogen cycle tracks the flow of nitrogen through an ecosystem . CC BY-NC 3.0.\n\n\nQ: Which cycle tracks the flow of nitrogen through an ecosystem?\n\n\nA:", "role": "user" ...
[ { "content": "Answer the following question given this paragraph: \n\nA tornado only strikes a small area. But it can destroy everything in its path. Most injuries and deaths from tornadoes are caused by flying debris ( Figure below ). In the United States, an average of 90 people are killed by tornadoes each y...
[ { "content": "Answer the following question given this paragraph: \n\nAll animals have innate behaviors, even human beings. Can you think of human behaviors that do not have to be learned? Chances are, you will have a hard time thinking of any. The only truly innate behaviors in humans are called reflex behavio...
[ { "content": "Answer the following question given this paragraph: \n\nThe pressure of the earth’s atmosphere, as with any fluid, increases with the height of the column of air. In the case of earth’s atmosphere, there are some complications. The density of the air is not uniform but decreases with altitude. Add...
[ { "content": "Answer the following question given this paragraph: \n\nSome animals change their depth by changing their density. Recall that things that are denser than their surroundings sink while those that are less dense than their surroundings float. Most fish have a swim bladder, a special sac that is fil...
[ { "content": "Answer the following question given this paragraph: \n\nHuman overpopulation, which is crowding out other species. It also makes all the other causes of extinction worse.\n\n\nQ: What phenomenon is crowding out other species and making all the other causes of extinction worse?\n\n\nA:", "role"...
[ { "content": "Answer the following question given this paragraph: \n\n\n\n\nQ: Dessication is an extreme and usually fatal form of what in animals?\n\n\nA:", "role": "user" }, { "content": "dehydration", "role": "assistant" } ]
[ { "content": "Answer the following question given this paragraph: \n\nInternal Respiration Internal respiration is gas exchange that occurs at the level of body tissues (Figure 22.23). Similar to external respiration, internal respiration also occurs as simple diffusion due to a partial pressure gradient. Howev...
[ { "content": "Answer the following question given this paragraph: \n\nAfter each mass extinction, new species evolve to fill the habitats where old species lived. This is well documented in the fossil record.\n\n\nQ: The fossil record shows that this type of event is followed by the evolution of new species to ...
[ { "content": "Answer the following question given this paragraph: \n\nBelow the topsoil is the “B” horizon. This is also called the subsoil . Soluble minerals and clays accumulate in the subsoil. Because it has less organic material, this layer is lighter brown in color than topsoil. It also holds more water du...
[ { "content": "Answer the following question given this paragraph: \n\nConceptual Questions 19.1 Electric Potential Energy: Potential Difference 1. Voltage is the common word for potential difference. Which term is more descriptive, voltage or potential difference? 2. If the voltage between two points is zero, c...
[ { "content": "Answer the following question given this paragraph: \n\nThe crocodilian digestive system is highly adapted to their lifestyle. Crocodilians are known to swallow stones, known as gastroliths , which help digest their prey. The crocodilian stomach is divided into two chambers. The first is powerful ...
[ { "content": "Answer the following question given this paragraph: \n\nPopulations usually grow bigger when they have what they need. How fast they grow depends on birth and death rates. They grow more slowly as they get close to the carrying capacity. This is the biggest population the environment can support.\...
[ { "content": "Answer the following question given this paragraph: \n\nAlthough air can transfer heat rapidly by convection, it is a poor conductor and thus a good insulator. The amount of available space for airflow determines whether air acts as an insulator or conductor. The space between the inside and outsi...
[ { "content": "Answer the following question given this paragraph: \n\n\n\n\nQ: Most plants grow continuously, except for what periods?\n\n\nA:", "role": "user" }, { "content": "dormant", "role": "assistant" } ]
[ { "content": "Answer the following question given this paragraph: \n\nObservations can happen on many scales. You can use a microscope to observe tiny things. You can use a telescope to observe distant things in space. To learn about the effects of climate change, you could observe Earth's surface. How would yo...
[ { "content": "Answer the following question given this paragraph: \n\nCarboxylic acids are weak acids (see the chapter on acids and bases), meaning they are not 100% ionized in water. Generally only about 1% of the molecules of a carboxylic acid dissolved in water are ionized at any given time. The remaining mo...
[ { "content": "Answer the following question given this paragraph: \n\nDiseases of the endocrine system are relatively common. An endocrine disease usually involves the secretion of too much or not enough hormone. When too much hormone is secreted, it is called hypersecretion. When not enough hormone is secreted...
[ { "content": "Answer the following question given this paragraph: \n\nFor thousands of years, humans have understood that characteristics such as eye color, hair color, or even flower color are passed from one generation to the next. The passing of characteristics from parent to offspring is called heredity . H...
[ { "content": "Answer the following question given this paragraph: \n\n24.7 Nutrition and Diet Nutrition and diet affect your metabolism. More energy is required to break down fats and proteins than carbohydrates; however, all excess calories that are ingested will be stored as fat in the body. On average, a per...
[ { "content": "Answer the following question given this paragraph: \n\nAlkenes are unsaturated hydrocarbons with at least one double bond between carbon atoms.\n\n\nQ: What are unsaturated hydrocarbons with at least one double bond between carbon atoms called?\n\n\nA:", "role": "user" }, { "content":...
[ { "content": "Answer the following question given this paragraph: \n\nAll of the changes of state that occur between solid, liquid and gas are summarized in the diagram in the figure below. Freezing is the opposite of melting and both represent the equilibrium between the solid and liquid states. Evaporation oc...
[ { "content": "Answer the following question given this paragraph: \n\nThe adductor muscle that closes the jaw is composed of two muscles in mammals: the temporalis and the masseter. These allow side-to-side movement of the jaw, making chewing possible, which is unique to mammals. Most mammals have heterodont te...
[ { "content": "Answer the following question given this paragraph: \n\nMost of the pathogens that cause STIs enter the body through mucous membranes of the reproductive organs. All sexual behaviors that involve contact between mucous membranes put a person at risk for infection. This includes vaginal, anal, and ...
[ { "content": "Answer the following question given this paragraph: \n\n\n\n\nQ: The activation of what kind of buds induces branching?\n\n\nA:", "role": "user" }, { "content": "axillary buds", "role": "assistant" } ]
[ { "content": "Answer the following question given this paragraph: \n\nSexual reproduction involves haploid gametes and produces a diploid zygote through fertilization.\n\n\nQ: Sexual reproduction involves haploid gametes and produces a diploid zygote through what process?\n\n\nA:", "role": "user" }, { ...
[ { "content": "Answer the following question given this paragraph: \n\nAll alkanes are composed of carbon and hydrogen atoms, and have similar bonds, structures, and formulas; noncyclic alkanes all have a formula of CnH2n+2. The number of carbon atoms present in an alkane has no limit. Greater numbers of atoms i...
[ { "content": "Answer the following question given this paragraph: \n\nMale Reproductive System Erectile dysfunction (ED) is a condition in which a man has difficulty either initiating or maintaining an erection. The combined prevalence of minimal, moderate, and complete ED is approximately 40 percent in men at ...
[ { "content": "Answer the following question given this paragraph: \n\nImmovable joints allow no movement because the bones at these joints are held securely together by dense collagen . The bones of the skull are connected by immovable joints.\n\n\nQ: What secures together immovable joints and prevents them fro...
[ { "content": "Answer the following question given this paragraph: \n\nTransform faults are the site of massive earthquakes.\n\n\nQ: Transform faults are the site of massive what?\n\n\nA:", "role": "user" }, { "content": "earthquakes", "role": "assistant" } ]
[ { "content": "Answer the following question given this paragraph: \n\nRocks can break apart into smaller pieces in many ways. Ice wedging is common where water goes above and below its freezing point ( Figure below ). This can happen in winter in the mid-latitudes or in colder climates in summer. Ice wedging is...
[ { "content": "Answer the following question given this paragraph: \n\nThe diatoms are unicellular photosynthetic protists that encase themselves in intricately patterned, glassy cell walls composed of silicon dioxide in a matrix of organic particles (Figure 23.18). These protists are a component of freshwater a...
[ { "content": "Answer the following question given this paragraph: \n\nA compound is a unique substance that forms when two or more elements combine chemically. Compounds form as a result of chemical reactions. The elements in compounds are held together by chemical bonds. A chemical bond is a force of attractio...
[ { "content": "Answer the following question given this paragraph: \n\nFossil fuels include coal, oil, and natural gas. Fossil fuels are the greatest energy source for modern society. Millions of years ago, plants used energy from the Sun to form carbon compounds. These compounds were later transformed into coal...
[ { "content": "Answer the following question given this paragraph: \n\nThe other idea is that evolution occurs by natural selection. Natural selection is the process in which living things with beneficial traits produce more offspring than others do. This results in changes in the traits of living things over ti...