Which of the following $U$-shaped bones is independently situated in the human body and provides support to the tongue?

The vertebra which bears the whole weight of the skull is

Tick the wrong option regarding human beings.

The pelvic girdle of birds is attached to a complex structure formed by the fusion of the last thoracic,all lumbar,and the first few caudal vertebrae. This structure is called:

In vertebrate animals,where is $80 \%$ of the total phosphorus incorporated?

Choose the wrongly matched option.