You are presented with the quiz "Thirst is used to make a cow realize that it needs to replenish its bodily what by the body?" 

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 "today's animal is the cow". 

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


 

        water   