Fact 1: Friction causes an object to lose energy.

Fact 2: Reduces heat friction build up.

Given the two facts above, answer the question "What causes an objects to lose energy?" with the following options: 
- Greenhouse gasses
 - layers of fat
 - fur and fat
 - Dehydration
 - heat build up
 - sweating
 - chemical messengers
 - Temperature


 

     heat build up    