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Which one of the following characters is not typical of the class-Mammalia?

(a) Seven cervical vertebrae

(b) Thecodont dentition

(c) Ten pairs of cranial nerves

(d) Alveolar lungs

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Correct option  (c) Ten pairs of cranial nerves

Explanation:

Ten pairs of cranial nerves are not common in mammals but common in frog. In mammals 12 pairs of cranial nerves are found.

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