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13 Cards in this Set
- Front
- Back
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evolution
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change over time by which modern organisms have descended from ancient organisms
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theory
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a well tested explanation that unifies a broad range of observations
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artificial selection
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selection by humans by humans for breeding of useful traits from the natural variation among different organisms
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struggle for existence
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competition among members of a species for food, living space, and a need for the other necessities of life
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fitness
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ability of an organism to survive and reproduce in its environment
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adaptation
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organ that serves no useful function in an organism
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survival of the fittest
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process by which individuals that aree better suited to their environment survive and reproduce most successfully; also called natural selection
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natural selection
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process by which individuals that are betrter suited to their environment survive and reproduce most successfully, also called survibal 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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common descent
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principle that all living things were derived from common ancestors
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homologous structures
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structures that have different mature forms in different organisms, but develop from the same embryonic tissues
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vestigial organs
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organ that serves no useful function in an organism
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fossils
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preserved remains or evidence of an ancient organism
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