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change in a kind of organism over time; process by which modern organism have descended from ancient organisms
selection 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 the other necessities of life
survival of the fittest
process by which individuals that are better suited to their enviornment survive and reproduce most successfully; also called natural selection
process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest
descent with modification
principle that each living species has descended, with changes, from other species over time
structures that have different mature forms in different organisms but develop from the same embryonic tissues
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