Having two ears helps us identify the direction from which sound is coming.
Consider the following statements.
i) Ears help our brain to sense from which directions the sounds are coming.
ii) Eustachian tubes equalize the air pressure on either side of the eardrum.
Sound is produced by vibration. To detect sound, some part of our ear should also vibrate when sound strikes it. Which part of the ear is this and how does it help us in hearing the sound?