AP BIOLOGY

Detailed explanation-1: -He noticed that each finch species had a different type of beak, depending on the food available on its island. The finches that ate large nuts had strong beaks for breaking the nuts open. Finches that ate small nuts and seeds had beaks for cracking nuts and seeds.

Detailed explanation-2: -In Galapagos he found a remarkable population of plants, birds and reptiles that had developed in isolation from the mainland, but often differed on almost identical islands next door to one another and whose characteristics he could only explain by a gradual transformation of the various species.

Detailed explanation-3: -Charles Darwin studied the finches of the Galapagos Islands and found that their beaks vary in shape and size. Darwin found that the finches that ate mostly insects had long, narrow beaks. Finches that ate mostly seeds had shorter, broad beaks that they used to crush seeds.