the gradual change in a species over time.

a well-tested concept that explains a wide range of observations.

the process by which individuals that are better adapted to their environment are more likely to survive and reproduce.

any difference between individuals of the same species

similar structures that related species have inherited from a common ancestor.

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Evolution

Life Science

Term	Definition
evolution	the gradual change in a species over time.
scientific theory	a well-tested concept that explains a wide range of observations.
natural selection	the process by which individuals that are better adapted to their environment are more likely to survive and reproduce.
variation	any difference between individuals of the same species
homologous structure	similar structures that related species have inherited from a common ancestor.