Question

practice it
three bones in the middle ear that vibrate in response to vibrations of the
eardrum
ossicles
semicircular canals
eardrum
cochlea
organ of corti

Explanation:

The ossicles are the three bones (malleus, incus, stapes) in the middle ear that vibrate in response to eardrum vibrations. Semicircular canals are for balance (not sound - vibration transmission). The eardrum itself vibrates but is not the three - bone structure. The cochlea is in the inner ear (converts vibrations to neural signals). The organ of Corti is part of the cochlea (has hair cells for hearing).

Answer:

ossicles