Which of the following are the features of mammals?

Warm-blooded

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Viviparous animals

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Presence of mammary glands

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All of the above

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Solution

The correct option is B All of the above
Mammals are warm-blooded (can regulate their body temperature). They are viviparous animals (except platypus), which means they give birth to young ones directly. Mammals are characterized by the presence of mammary glands and hair.
So, the correct answer is option D.

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