You are presented with the question "What allows for movement in animals?" and the following answer choices: 
- the digestive system
 - an external framework
 - energizing crystals
 - Veins and arteries.
 - spinning wheels
 - burning energy
 - arteries
 - changing tires

Now knowing that an animal requires energy to move and when an animal moves, it burns energy, choose the best answer.


 

      burning energy   