because it was amphibian it wants to breathe on land and breathe through lungs on land and breathe through skin in water.
When you are huffing and puffing after running around, you have to breathe through your mouth, right? Sucking air through your nostrils doesn’t get you enough oxygen. Well, frogs breathe through their nostrils for the same reason — when they’re hopping around on land they can’t get enough oxygen through their skin


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The skin of frog is moist and frog as less capacity of breathing so that frog breathe to skin
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When frog goes in water than it uses its skin to breathe.