What is an example of evolutionary novelty, Biology

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

The reptile skin is keratinized and impermeable to water whereas the amphibian skin is permeable. The skin impermeability made impossible the cutaneous gas exchange done by amphibians and respiration became dependent on internal organs like lungs and airways.

 


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