Fact 1: Thick fur can be used for keeping warm.

Fact 2: When the body is warm, heat production is minimized.

Given the two facts above, answer the question "thick fur can be used for minimizing what?" with the following options: 
- heat energy
 - heat production
 - scattered light
 - energy usage
 - freezer burn
 - movie production
 - fur production
 - Temperature


 

  heat production       