You are presented with the quiz "How are nitrogenous wastes excreted?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "urine is the liquid waste product of the body that is excreted by the urinary system" and "nitrogenous wastes leave the body in the urine". 

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


 

    urine       