Fact 1: An animal requires warmth for survival.

Fact 2: Without blubber, their fur is essential for survival.

Given the two facts above, answer the question "Animals require fur as it is essential for what?" with the following options: 
- rest
 - sleeping
 - growth
 - hunting
 - softness
 - mating
 - health
 - warmth


 

        warmth 