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Illustration of evolutionary novelty in reptilia

As compared to amphibians what is an illustration of evolutionary novelty existed in beings of the group Reptilia against the loss of water via the skin?

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The reptile skin is keratinized and impermeable to water whereas the amphibian skin is permeable. The skin impermeability made not possible the cutaneous gas exchange executed by amphibians and respiration became dependent on the internal organs such as lungs and airways.

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