The major constituent of bone is:

Vertebrochondral ribs in human are $:-$

The bones that form a bridge between the cranium and the upper jaw dorsally and ventrally,respectively,are

Find out the true and false statements.
$(A)$ Human skeleton has $206$ bones
$(B)$ There are $12$ pairs of ribs in human beings
$(C)$ Sternum is present on the dorsal side of the body
$(D)$ All mammals (except a few) have $8$ cervical vertebrae
$(E)$ Ribs are bicephalic

Through which aperture does the spinal cord pass out of the cranium?

How many pairs of ribs are present in human beings (in $pairs$)?