You are presented with the question "what has permeable skin that easily absorbs substances from the environment?" and the following answer choices: 
- ferns
 - a fish
 - humans
 - animals
 - scales
 - bats
 - skin cells
 - frogs

Now knowing that amphibians have permeable skin that easily absorbs substances from the environment and all frogs are amphibians, choose the best answer.


 

        frogs 