Question

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 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 semicircular canals are part of the inner - ear balance system. The eardrum itself vibrates but is not the three - bone structure. The cochlea is a spiral - shaped organ in the inner ear for hearing (not the vibrating bones). The organ of Corti is within the cochlea and contains hair cells for auditory transduction.

Answer:

ossicles