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

1. Thecodont dentition
2. Alveolar lungs
3. Ten pairs of cranial nerves
4. Seven cervical vertebrae

Correct answer: Ten pairs of cranial nerves

Solution

Mammals typically have thecodont dentition, alveolar lungs, and usually seven cervical vertebrae. They do not have ten pairs of cranial nerves; mammals have twelve pairs.

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