Answer:
D
Explanation:
1. The eardrum: which separates the ear canal from middle ear. The eardrum, is also known by the name, tympanic membrane.
2. Function: eardrum is involved in hearing.
3. Sound waves cause eardrum to vibrate.
4. In human audition, the vibration of the ossicles is caused by vibration of the eardrum and transmitted directly to the oval window.
5. so ans is eardrum; oval window.