Preen gland occurs in

Pisces

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Aves

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Reptilia

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Mammalia

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Solution

The correct option is B Aves
Birds don't have glands in their skin except for preen gland. The secretion of this gland is used in preening of feathers and making them waterproof. Reptiles also have dry skin. Mammals, however, have a number of glands in their skin. Thus, the correct answer is option B.

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