Fact 1: Thirst is used to make an animal realize that it needs to replenish its bodily water by the body.

Fact 2: Every plant and animal needs water to survive.

Given the two facts above, answer the question "What helps animals to survive?" with the following options: 
- trees
 - food
 - warmth
 - fur
 - steam
 - thirst
 - friendship
 - dreams


 

      thirst   