You are presented with the question "Thirst is used to make animals realize they need to what?" and the following answer choices: 
- remove their cells
 - filter their beverages
 - recovery time from fatigue
 - reusing things
 - moisturize their eyes
 - hydrate their cells
 - Converting waste.
 - they body they live in

Now knowing that thirst is used to make an animal realize that it needs to replenish its bodily water by the body and water hydrates the cells, choose the best answer.


 

      hydrate their cells   