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What Chief distinguishing features of the mammals are?

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Hairy skin and ovary

Hairy skin and mammary glands

Mammary glands and teeth

Pinna and teeth

answer is B.

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Detailed Solution

Mammals are characterised by the presence of mammary gland which secretes 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 pinna.

Hence, the correct answer is option B.

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