Question

what structure separates the outer ear from the middle ear? a auditory tube b round window c oval window d tympanic membrane

Explanation:

The tympanic membrane, also known as the eardrum, is the structure that physically separates the outer ear from the middle ear. Sound waves cause it to vibrate, which then transmits the sound energy to the middle - ear ossicles. The auditory tube connects the middle ear to the nasopharynx, the round window and oval window are structures in the inner - ear connection to the middle ear.

Answer:

D. Tympanic membrane