AP BIOLOGY

Detailed explanation-1: -While on the voyage Darwin was amazed by the variety of living things he saw. Today scientists have identified more than 1.7 million species of organisms and not all living things have been identified. A species is a group of similar organisms that can mate with each other and produce fertile offspring.

Detailed explanation-2: -Darwin was also fortunate that the Beagle took him to the Galapagos Islands, where he observed various animals and birds that had evolved in an isolated environment. His observations led him to his famous theory of natural selection.

Detailed explanation-3: -Darwin found that there wasn’t a single amphibian or large mammal on the island. This was particularly interesting because that would mean only animals that could travel the length of the ocean would be able to inhabit the Galapagos.