Question

practice it
membrane - covered opening that separates the middle ear from the inner ear
oval gable
oval door
oval valance
oval window
oval banister

Explanation:

The oval window is a membrane - covered opening that separates the middle ear from the inner ear. It is an important structure in the auditory system. When the stapes (a bone in the middle ear) vibrates, it transmits vibrations to the oval window, which then sets the fluid in the inner ear (cochlea) in motion, initiating the process of hearing.

Answer:

oval window