If a species of bird with an intermediate beak size evolves into two varieties,one with large beaks and one with small beaks,this could result from disruptive selection.

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Disruptive selection is a type of natural selection where extreme phenotypes are favored over intermediate phenotypes, leading to the splitting of a population into two or more distinct groups. In the case of a species of bird evolving into two varieties with different beak sizes, it is possible that disruptive selection favored birds with either large or small beaks, leading to the divergence of the population into two separate varieties.

If a Species of Bird with an Intermediate Beak Size