All mammals without any exception are characterized by

Viviparity and biconcave red blood cell

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Extra-abdominal testis and four-chambered heart

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Heterodont teeth and

12

pairs of cranial nerves

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A muscular diaphragm and milk producing glands

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Solution

The correct option is B Heterodont teeth and $12$ pairs of cranial nerves
Heterodont is an animal, which possesses more than a single tooth morphology. All mammals have up to four distinct types of teeth. Cranial nerves are the nerves that emerge directly from the brain. All mammals have twelve pair of cranial nerves.

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