You are presented with the question "What is converted into mechanical energy when bats fly?" and the following answer choices: 
- batteries
 - chemical energy
 - adding heat
 - electrical energy
 - objects that have mass
 - mechanical waves
 - electricity
 - direct energy

Now knowing that when an animal moves , chemical energy is converted to mechanical energy and bats are animals that fly around at night, choose the best answer.


 

  chemical energy       