You are presented with the quiz "What is used by animals to realize their bodies need hydration?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "thirst is used to make an animal realize that it needs to replenish its bodily water by the body" and "every body needs plenty of hydration, and water is the best source of that hydration". 

So, what's the best answer to the question?


 

      thirst     