Studies of Darwin's finches have found that at certain points in time all finches on the island have either wide beaks or sharp narrow beaks. The type of evolution that leads to this phenotype distribution is:

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This phenotype distribution is the result of disruptive selection, where extreme phenotypes (wide or narrow beaks) are favored over intermediate phenotypes. This can occur in environments where two or more distinct niches exist, each favoring a different phenotype.

Studies of Darwin's Finches Have Found That at Certain Points