Question

Which of the following is common among mammals ?

• A. They undergo no moulting
• B. They have seven cervical vertebrae
• C. They are carnivores
• D. They have ventral nerve cord.

Answer 1

The correct option is A They undergo no moulting

●Mmmals do not undergo moulting. Moulting is usually exhibited by invertebrates.

●In many vertebrate species, cervical vertebrae are variable in number, however almost all mammals have seven cervical vertebrae including those with short neck such as elephants or whales and those with very long necks, such as giraffes. But there are a few exceptional cases in which there are nine cervical vertebrae in mammals.

● All the mammals are not carnivorous, they may be herbivorous, carnivorous and omnivorous also.

● Mammals have dorsal nerve cord.

So, the correct option is (A).