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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.
the mass number is used to calculate the number of _________in one atom of an elemement. In order to calculate the number of neutrons you must subtract the _______from the ______.
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