A distinguishing features of class mammalia is

Presence of diaphragm

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Seven cervical vertebrae

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Both A and B

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None of the above

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Solution

The correct option is A Both A and B
Mammals have some striking features that can differentiate them from all other animals such as placenta, mammary gland, skin with hairs, muscular diaphragm, four-chambered heart and seven cervical vertebrae. Thus, the correct answer is option C.

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