12 pairs of cranial nerves are present in

Reptilia

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Birds only

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Mammals only

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All of the above

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Solution

The correct option is D All of the above
Reptiles, birds and mammals all belongs to higher vertebrates. All organisms in higher veetebrate groups have 12 pairs of cranial nerves which arise directly from the brain and brain stem.
Thus, the correct answer is option D.

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