Question

Nearly all mammals have seven cervical (neck) vertebrae. This fact implies that

A.
all mammals have to stretch their necks to obtain food.

B.
all animals can turn their heads the same amount.

C.
all mammals descended from a common ancestor.

D.
predators prefer to eat animals with either six or eight cervical vertebrae.

Answer 1

c.all mammal descended from a common ancestor.

Answer 2

The correct answer is option c- nearly all mammals descended from common ancestors.

Human cervical vertebra consists of 7 bones from top to bottom:

- C1

- C2

- C3

- C4

- C5

- C6

- C7

Cervical vertebra are located just below the skull are the neck bones that control the neck movements. In humans, cervical vertebrae are the smallest of all vertebrae. In different organisms, the size of these vertebrae vary.