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Which of the following features distinguish mammals from other vertebrates ?

A. Hairy skin and oviparity

B. Hairy skin and mammary glands

C. Mammary glands and teeth

D. Pinna and teeth

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Correct Answer : B.


The most unique mammalian characteristic is the presence of milk producing glands (mammary glands) by which the young ones are nourished. The skin of mammals is unique in possessing hair.

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