You are presented with the question "What causes an objects to lose energy?" and the following answer choices: 
- Greenhouse gasses
 - layers of fat
 - fur and fat
 - Dehydration
 - heat build up
 - sweating
 - chemical messengers
 - Temperature

Now knowing that friction causes an object to lose energy and reduces heat friction build up, choose the best answer.


 

     heat build up    