The only factor necessary for evolution to occur is that there must be variation in organisms in a population.
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Q2: Populations that can interbreed and produce fertile
Q5: Whether a mutation is harmful or beneficial
Q9: All mutations are either harmful or beneficial.
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Q14: Homologous structures probably indicate descent with modifications
Q60: The fossil record shows a sequence of
Q63: Vestigial structures are those that have only
Q64: The controlling factor in variation in organisms
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