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  But this does not happen for the other sub-population, where crow numbers are
                       very high.
                     As a result, the green variation will not be selected at the first site, while it will be
                       strongly selected at the second.
                     Together, the processes of genetic drift and natural selection will result in these
                       two isolated sub-populations of beetles becoming more and more different from
                       each other.
                     Eventually, members of these two groups will be incapable of reproducing with
                       each other even if they happen to meet.






























































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