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Q. How different is the fish epidermis from the amphibian epidermis?
The fish epidermis is very contains and thin mucus-secreting cells the fish skin doesn't present keratin, the mucus has a protective function and it also helps the sliding of the animal under water, the fish scales originate from the dermis and not from the epidermis.
In amphibians there is already a slight keratinization of the skin probably an additional adaptation to the terrestrial environment. Amphibians have wet and smooth epidermis without scales, these features facilitates their cutaneous respiration.
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