Fact 1: Hibernation is used for conserving energy by some animals.

Fact 2: Energy conservation is an important survival trait.

Given the two facts above, answer the question "What is an important survival trait?" with the following options: 
- food and shelter
 - Endocrine system
 - apathy
 - laziness
 - hormones
 - hibernation
 - vanity
 - health


 

      hibernation   