Stratum corneum is absent in

Bony fish

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Amphibians

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Reptiles

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All of the above

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Solution

The correct option is A Bony fish
Corneous cell envelopes are absent in fish and first appeared in adult amphibian epidermis. Complete absence of a protective keratinized stratum corneum is compensated by the relatively thick squamous zone and the copious mucus secretion in fish.

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