Amphibians, such as frogs, have adapted to have thin, very permeable skin that is well supplied with blood vessels. How does this adaptation most likely amphibians survive in aquatic environments?
A. It allows them to maintain fairly stable internal temperatures.
B. It allows them to absorb nutrients directly from their environment.
C. It allows them to release chemicals into their environment to attract mates.
D. It allows them to take in oxygen and release carbon dioxide through their skin.