evolution, changes over time , fossil, the remains of an organism, gradualism, slow change , embryro, organism early stages of growth, vestigial structure, no longer used by organism, homologous structure, same structure/different function, population, Organisms of a species living together in a group, genetic variation, differences in individuals or populations, genetic drift, a change in the gene pool, by chance., gene flow, transfer of genetic material from one population to another, natural selection, mother nature chooses who lives or dies, evolutionary mechanisms , cause changes in a population.

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