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Moist skin helps in respiration. A thin film of water is formed on the surface of the frog, into which the atmospheric oxygen gets dissolved and ultimately diffuses into the blood vessels underlying the skin. This is the reason, the skin of frog is richly vascular.

Some amphibian species don't even have lungs but obtain all their oxygen this way. Frogs do have lung, though, but they still need to breathe through their skin as well.

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12y ago

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