Fact 1: Afirecracker converts chemical energy into sound.

Fact 2: Hearing is the act of perceiving sound.

Given the two facts above, answer the question "What converts chemical energy into what we hear?" with the following options: 
- Gunshots
 - An object is seen
 - a lightbulb
 - ice
 - sensory neurons
 - a firecracker
 - animals
 - a stove


 

      a firecracker   