You are presented with the quiz "What is a process of removing wastes and excess water from the body?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "excretion is the process of removing wastes and excess water from the body" and "ketones are exhaled and excreted in urine". 

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


 

  urination         