Studies of Galápagos finches have found that at certain points in time all finches on the island have either wide beaks or sharp narrow beaks.What is the type of evolution that leads to this phenotype distribution?

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The phenomenon described suggests disruptive selection, which favors extreme phenotypes over intermediate ones. In this case, birds with either wide or sharp narrow beaks are better adapted to their environment than those with medium-sized beaks.

Studies of Galápagos Finches Have Found That at Certain Points