The ultimate source of organic evolution is

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(D) Organic evolution relies on the presence of genetic variation within a population.Mutations are sudden,heritable changes in the $DNA$ sequence tha

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Mutations

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(D) Organic evolution relies on the presence of genetic variation within a population.Mutations are sudden,heritable changes in the $DNA$ sequence that introduce new alleles into a gene pool.While natural selection acts upon these variations,mutations are the primary and ultimate source of new genetic material,providing the raw material for evolution to occur over time.

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