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Amphibians and Reptilia

Compared to the amphibians provide an example of evolutionary novelty which is present in beings of the class Reptilia which prevents the loss of water through the skin?

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Reptile skin is keratinized and impermeable to the water whereas skin of amphibian is permeable. This impermeability of the skin made impossible the cutaneous gas exchange which is performed by the amphibians and respiration became dependent on the internal organs such as lungs and airways.

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