The correct option B. Gene flow, is an example of genetic drift.
Gene flow is the process through which genetic variety is transferred from one population to another population, changing the overall amount of genetic diversity (gene pool) within the first group.
It can happen in a number of ways. As an illustration, as birds migrate from one habitat to another, the gene pool changes.
Genetic drift occurs when the frequency of different alleles, or variable forms of a gene, fluctuates over time through chance. Changes in allele frequencies are used to measure these differences in allele presence.
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