Fact 1: Amphibians have permeable skin that easily absorbs substances from the environment.

Fact 2: All frogs are amphibians.

Given the two facts above, answer the question "What feature allows frogs to absorb substances from the environment?" with the following options: 
- four limbs
 - poison dart frog
 - hydrate their cells
 - permeable skin
 - layers of fat
 - a cuticle
 - predators
 - double eyelid


 

    permeable skin     