Which is not a characteristic feature of mammals ?
Seven cervical vertebrae
Left aortic arch in the circulatory system
Ten pairs of carnial nerves
Diphyodont teeth
A
Diphyodont teeth
B
Ten pairs of carnial nerves
C
Seven cervical vertebrae
D
Left aortic arch in the circulatory system
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Solution
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Characteristics of Mammals are:
1. Diphyodont teeth (most mammals).
2. Seven cervical vertebrae (except manatees and sloths).
3. Left systematic arch in the circulatory system.
4. Twelve pairs of cranial nerves.
So the correct answer is option 'A'.
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