Fact 1: Preventing the transfer of heat from an organims 's body causes that organism to keep warm.

Fact 2: Heat is a measurement of transferable energy.

Given the two facts above, answer the question "what can preventing the transfer of cause the body to keep warm in an organism?" with the following options: 
- hair
 - Collagen
 - sweating
 - hydration
 - the skin
 - exercise
 - fur
 - energy


 

        energy 