Which pair of ribs is not connected ventrally?

Which bone is not formed from cartilage during its development?

Which of the following statements are correct with reference to the human endoskeleton?
$A$. Human skull is monocondylic.
$B$. The joint between any two adjoining vertebrae is a cartilaginous joint.
$C$. In human beings, the number of cervical vertebrae is seven.
$D$. All ribs except the last $2$ pairs are bicephalic.
$E$. The occipital bone of the skull is articulated with the atlas vertebra.
Choose the correct answer from the options given below:

All the cartilaginous bones are previously:

In mammals,the zygomatic arch is formed by

Human vertebral column is formed by