You are presented with the quiz "what do organisms use thirst for?" 

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 "animals experience hunger, thirst, fear, sickness, injury and strong maternal instincts". 

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


 

   water        