Question

The part which equalises the air pressure in the middle amd external ear

Answer 1

The ear ossicle attached to the tympanum equalises the air pressure in the middle and external ear.

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Answer 2

Actually Eustachian tube is the part which connects the middle ear cavity with the pharynx, that helps in equalising the pressures on either sides of the ear drum( NCERT Biology class XII page 325)