Fact 1: Amphibians have permeable skin that easily absorbs substances from the environment. Fact 2: All frogs are amphibians. Given the two facts above, what has permeable skin that easily absorbs substances from the environment?

Possible answers:
[1]. ferns
[2]. a fish
[3]. humans
[4]. animals
[5]. scales
[6]. bats
[7]. skin cells
[8]. frogs
The answer is:
[8].