The most important mammalian character among the following is:

Warm-blooded

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Pinna

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Diaphragm

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Mammary glands

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Solution

The correct option is D Mammary glands
The four main characteristics exhibited by mammals are hair, diaphragm, mammary glands and three specialized middle ear bones. Out of these, the mammary gland is the most unique characteristic exhibited by only mammals and is not shared by any other group of animals.
Thus, the correct answer is option D.

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