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13 Cards in this Set

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