Question

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

Explanation:

The ossicles are the three small bones (malleus, incus, stapes) in the middle ear. They vibrate in response to eardrum vibrations and transmit sound vibrations to the inner ear. The eardrum (tympanic membrane) itself vibrates with sound but is not the three - bone structure. The organ of Corti is in the inner ear (cochlea) and is involved in converting vibrations to neural signals. The semicircular canals are part of the vestibular system (balance - related) in the inner ear. The cochlea is the spiral - shaped organ in the inner ear for hearing but not the three - bone structure.

Answer:

ossicles