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

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.

Solution

In higher vertebrates (reptiles, birds, mammals) there are 12 pairs of cranial nerves which fish and ambhibian have 10 pairs of cranial nerves. Alveolar lungs, seven cervical vertebrae, and thecodont dentition are typical of class Mammalia.

Asked in: NEET 2005

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