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Q.

What are the main distinguishing features of mammals?

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a

Hairy skin and mammary glands

b

Mammary glands and teeth

c

Hairy skin and ovary

d

 Pinna and teeth

answer is B.

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Detailed Solution

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Mammals are characterised by the presence of mammary glands, hairs on the skin, and external ears.

The mammary glands secrete milk for the nourishment of the young ones.

They have hairs on their skin and sweat glands for regulating body temperature.

They have an external ear or ear lobe called the pinna.

 

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