You are presented with the question "Why do animals sleep through winter?" and the following answer choices: 
- To conserve energy
 - recovery time from fatigue
 - They get bored
 - Endocrine system
 - They only like warmth
 - dormant state
 - To save time
 - hydration

Now knowing that hibernation is used for conserving energy by some animals and animals that sleep through the winter are said to hibernate, choose the best answer.


 

 To conserve energy        