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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