Fact 1: Adoorbell converts electrical energy into sound.

Fact 2: When the sound waves hit the eardrum in the middle ear, the eardrum starts to vibrate.

Given the two facts above, answer the question "When a doorbell rings, what part of the body vibrates?" with the following options: 
- organ
 - legs
 - nerves
 - arm
 - cells
 - eye
 - eardrum
 - Limbs


 

       eardrum  