What are the classical adaptations of amphibians?
"Amphibian" means "living both in water and on land" (see here). Here is a small list of classic adaptations in amphibians:


Eyes and nostril are positioned to poke out of the water while the rest of the body is immersed
Ears don't let any water gets in
Skin is very thin and allow direct gazeous and water exchange
Paws are webbed to move into water
Larvae of most amphibian species start their life in the water