When populations of two different species interact over a long period of time, changes in the gene pool of populations of one species can lead to changes in the gene pool of the other. This process is called commensalism.

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The described process is not commensalism, but rather coevolution. Commensalism refers to a type of symbiotic relationship where one species benefits while the other is neither helped nor harmed.

When Populations of Two Different Species Interact Over a Long