inherited characteristic that increases an organism’s chance of survival

principle that all living things have a common ancestor

ability of an organism to survive and reproduce in its environment

changes in an organism over long periods of time

process by which individuals that are better suited to their environment survive and reproduce most successfully

principle that each living species has descended, with changes, from other species over time

differences among individuals of a species

process by which unrelated organisms independently evolve similarities when adapting to similar environments

process by which one species evolves into two or more different forms

preserved remains or evidence of an ancient organism

process by which individuals that are better suited to their environment survive and reproduce most successfully

selection by humans for breeding of useful traits from the natural variation among different organisms

a trait or organ that appears similar in two unrelated organisms

organs that serve no useful function in an organism

competition among members of a species for food, living space, and other necessities of life

well-tested explanation that unifies a broad range of observations

structures that have different mature forms in different organisms but develop from the same embryonic tissues

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