Question

how do we listen to the sounds

Answer 1

because of our ear drum.

Answer 2

Hey friend,
Here is your answer
We can hear the sound in frequency from 20 Hertz to 20000 Hertz.
And in our ear structure,
it's differentiated into three parts,
The outer part
The middle part
and, The inner part
Now,
I) The outer part are that we can see
It contains Pinna in upper and by the middle section, the sound waves enter in our ears. and and then the ear canal comes from where the sound waves can go to the end of ear drum. And the outer part contains air.
II) The middle ear contains three small and delicate bones called hammer, anvil and stirrup. These bones are connected to one another. The one end of bone hammer is connected with our ear drum.And then bone anvil comes and then stirrup. These bones are in our ears to produce vibration and it could work only if the sound waves are of 20 Hertz or more. These middle part also contains air.
III) And then finally our inner part came. The inner ear has a coiled tube called cochlea. One side of Cochlea is connected to the middle ear. The cochlea contains liquid. The other side of Cochlea is connected to auditory nerve which goes into brain.
Don't get confused I can send an image of it because in my physics book it has given.
HOPE MY ANSWER WOULD BE HELPFUL TO YOU!!!!!!!!!☺☺