You are presented with the quiz "What and a semi-solid mass of waste are removed 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 "once the water is removed, the waste becomes a semi- solid mass and is prepared for excretion". 

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


 

   excess water        