Unlike humans , frog's unique skin helps them to exchange oxygen and drink.
Frog's skin is complex.
It's thin, covered in glands that produce mucus to keep the skin moist.
It is porous enough to allow air molecules to permeate.
A network of small blood vessels right underneath the skin absorbs oxygen directly from water or air and also allows carbon di oxide to driven out of the body.
Frog's porous skin is also how they drink. Water is getting into all those spaces in the skin and then absorbed across cell membrane of the cell.
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