Darwin studied specific species of animals on the Galapagos Islands and other places, and observed

similar species in different areas with unique traits

all birds have the same size beaks

giant turtles live longer than other species because of their large hearts

fossils hold the key to the past

The appropriate answer is B. Darwin observed different species in different areas with unique traits. Darwin theorized that this observation meant that animals are most time uniquely adapted to survival in its environment. This theory is the theory of natural selection. It states that the arrival and reproduction of organisms ais dependent on how they are adapted to their surroundings.