Fact 1: An animal requires warmth for survival.

Fact 2: Vegetation is required by many animals for warmth and security.

Given the two facts above, answer the question "What helps animals survive?" with the following options: 
- vegetation
 - rivers
 - valleys
 - traits
 - Pituitary gland
 - kinetic energy
 - hibernation
 - rocks


 

 vegetation        