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Aspecies of fish is unintentionally introduced into a marine ecosystem. the species has a similar diet to an existing fish species creating competition on for food. according to darwin's theory of evolution by natural selection, which of the following must occur for the existing species to evolve? how do i explain the natural variations in phenotype must be present in the existing species population.

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Aspecies of fish is unintentionally introduced into a marine ecosystem. the species has a similar di...
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