Fact 1: Staying warm has a positive impact on an animal 's survival.

Fact 2: Effective insulation is the way to keep the warm air warm.

Given the two facts above, answer the question "Effective insulation has a positive impact on an animal's what?" with the following options: 
- heat energy
 - survival
 - water
 - food
 - growth
 - ideas
 - Energy.
 - energy


 

  survival       