Which of the evolutionary forces is most likely to decrease variation between populations?

Name: Which of the evolutionary forces is most likely to decrease variation between populations?
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Question

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Gene flow involves the movement of genes from one population to another, which can reduce differences between populations by introducing new genetic variants to a population or spreading existing variants throughout a population. This can lead to the homogenization of genetic variation between populations over time.

Which of the Evolutionary Forces Is Most Likely to Decrease