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| selection by humans for breeding of useful traits from the natural variation among different organisms |
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| also called artificial selection |
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| competition among members of a species for food, living space, and the other necessities of life |
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| ability of an organism to survive and and reproduce in its natural environment |
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| inherited characteristic that increases an organism's chance of survival |
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| process by which individuals that are better suited to their environment survive and reproduce most successfully |
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| also called survival of the fittest |
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| descent with modification |
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| principle that each living species has descended, with changes, from other species over time |
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| principle that all living things have a common ancestor |
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| structures that have different mature forms in different organisms but develop from the same embryonic tissues |
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| organ that serves no useful function in an organism |
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