Chief features of mammals, which distinguish them from other vertebrates, are

Hair and oviparity

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Mammary glands, hairs on skin and diaphragm

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Pinna and teeth

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Teeth and mammary glands

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Solution

The correct option is A Mammary glands, hairs on skin and diaphragm
The key characteristic features of mammals are the presence of placenta, skin with hairs, mammary gland, muscular diaphragm and giving birth young one. Thus, the correct answer is option B.

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Mammals feed their young ones with __ secreted from their mammary glands.

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