Choose the wrongly matched option.

Human vertebral column is formed by

Read the following Assertion $(A)$ and Reason $(R)$ and choose the correct option.
Assertion $(A):$ All $12$ pairs of ribs are called bicephalic.
Reason $(R):$ Each rib is connected dorsally to the vertebral column by $2$ heads of articulation.

Red bone marrow is present in

In mammals,the lower jaw is made up of ....................

Name the bones that form the cranium.