You are presented with the quiz "Excessive physical and emotional exertion does what to an animal?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if an animal sweats then that animal 's bodily water decreases" and "sweat is the result of excessive physical and emotional exertion". 

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


 

  decreases its bodily water         