You are presented with the question "What is used as an important survival trait by some animals?" and the following answer choices: 
- bleeding
 - lying
 - hormones
 - food and shelter
 - hibernation
 - four limbs
 - proteins
 - crying

Now knowing that hibernation is used for conserving energy by some animals and energy conservation is an important survival trait, choose the best answer.


 

     hibernation    