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Question

Mammals are unique in possessing

A
milk producing glands
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B
hair
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C
oil glands
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D
Both (A) and (B)
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Solution

The correct option is D Both (A) and (B)
The most unique feature of mammals is the presence of mammary glands to nourish the young ones. The presence of hair on the skin is also a unique feature of these animals, which helps keep them warm. Oil glands are found in mammals (as sebaceous glands in the skin) and in birds (at the base of the tail).

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