Breast bone is also called

The human skeleton is divisible into which parts? Name them.

In the rib cage formation,which of the following is not used?

Presence of a foramen for an artery is a characteristic of which bone?

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.

The vertebrarterial canal (foramen transversarium) is present in the vertebrae that are: