Question

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

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 as it transmits vibrations from the middle ear to the inner ear. The other options (oval door, oval banister, oval gable, oval valance) are not anatomical structures related to the separation of the middle and inner ear.

Answer:

oval window