Which is the heaviest vertebra in humans?

The bone which is horse shoe shaped is

The skeletal system provides support and protection to body parts. Which of the following bones is distinct in its function?

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:

What type of bone is the axis?

Analogy type questions:
$(1)$ Striated muscles : Voluntary muscles :: Visceral muscles : .........
$(2)$ In the face : $22$ bones :: In the vertebral column : .......