Peter and Rosemary Grant demonstrated natural selection in finches on the Galapagos Islands. They found that during ……………………………., the number of finches with larger beaks increased, while the number of...

Peter and Rosemary Grant demonstrated natural selection in finches on the Galapagos Islands. They found that during ……………………………., the number of finches with larger beaks increased, while the number of birds with smaller beaks fell.