There is a population of giraffes. Some have short necks, some have medium-length necks, and some have long necks. If the short-necked individuals are regularly eliminated from the population, this would be an example of

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Directional selection occurs when natural selection favors one extreme of continuous variation over the other, leading to a shift in the population's phenotypic distribution. In this case, eliminating short-necked giraffes would favor those with longer necks, shifting the population towards longer neck lengths over time.

There Is a Population of Giraffes