How different is the fish epidermis from the amphibian epidermis?

1.	How different is the fish epidermis from the amphibian epidermis?
Answer» The fish epidermis is very thin and contains mucus-secreting cells. The fish skin does not 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 smooth and wet epidermis without scales. These features facilitate their cutaneous respiration.

Answer»

The fish epidermis is very thin and contains mucus-secreting cells. The fish skin does not 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 smooth and wet epidermis without scales. These features facilitate their cutaneous respiration.

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