Why cannot we move upper jaw ?

Can you move the upper jaw?

Can you move the upper jaw as well?

P : Snail moves slowly due to wavy motion of its foot Q : The joint between upper jaw and lower jaw is immovable joint.

Guess who I am I am a joint between upper jaw and skull.

the bone between upper jaw and skull

at the time fever why cannot we taste the food

We cannot move ____when we open our mouth.

Why D_2O cannot be used as drinking water ?

Why do we need proper drainage system?