Fact 1: When an animal moves , chemical energy is converted to mechanical energy.

Fact 2: Bats are animals that fly around at night.

Given the two facts above, answer the question "What is converted into mechanical energy when bats fly?" with the following options: 
- batteries
 - chemical energy
 - adding heat
 - electrical energy
 - objects that have mass
 - mechanical waves
 - electricity
 - direct energy


 

  chemical energy       