The eighth cranial nerve $(auditory)$ of vertebrates leads from the brain to:

In mammals,what has developed as the external ear?

The human ear is equipped to register sounds of frequencies between

The three tiny bones present in the middle ear are called ear ossicles. Write them in the correct sequence beginning from the ear drum.

$.....P.....$ ends at the oval window,while $.....Q.....$ ends at the round window,which opens to the middle ear.
$\quad\quad\quad P\quad\quad \quad Q$

Comment upon the role of the ear in maintaining the balance of the body and posture.