Final answer:
Galapagos marine iguanas exhibit adaptations due to natural selection, which helped them to survive and find food in their unique marine environment on the Galapagos Islands.
Step-by-step explanation:
The kind of selection found in the Galapagos marine iguanas is an example of natural selection, which was observed and outlined by Charles Darwin during his visit to the Galapagos Islands. This selection process describes how the marine iguanas have adapted to their environment. The marine iguanas spend most of their time in the water, foraging for seaweed, which contrasts with the land iguanas that feed on cacti on the islands. These adaptations to different ecological niches help to explain why these two species of iguanas exhibit significant differences, even though they exist in the same geographical area.
In the case of the Galapagos marine iguana, their distinct behavior and ecological role have likely developed due to the pressures of surviving and finding food within their marine environment.