You are presented with the quiz "Which body of water would be able to  dissolve oxygen and nutrients the best?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "running water is better able to dissolve oxygen and nutrients than standing water" and "also, running water in rivers is the major force of erosion on the surface of the earth". 

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


 

       River    