Question

On the Galápagos Islands, Charles Darwin observed what

Answer 1

Darwin discovered that there were similar animals on the islands and that they were unique to each island. Each of the animals were perfectly adapted to the islands they lived on. Darwin also discovered many different types of finches on the islands. 

Answer 2

He observed that (c) species similar to mainland South America species.

Explanation: one example of different, yet related, animal species often occupied different habitats within a local area was the tortoises! These islands are close to one another, yet they have ecological conditions. Several islands were home to distinct forms of giant land tortoises. Darwin eventually learned from the island's governor that the tortoises' shells varied in predictable ways from one island to another.