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

Fact 2: Bears use the fat as energy over the winter hibernation.

Given the two facts above, answer the question "Why do bears hibernate?" with the following options: 
- use greater resources
 - one celled organisms
 - they are lazy
 - conserve energy
 - When it's cold
 - hard outer covering
 - hydration
 - more sleep


 

    conserve energy     