Choose your answer from: 1). bass; 2). lake; 3). H20; 4). h2o; 5). heat; 6). vitamins; 7). hydrogen; 8). bogs;

You are presented with the quiz "what is better able to dissolve oxygen and nutrients when it's running over standing?" 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 "water is made up of H2O molecules". So, what's the best answer to the question?
Answer:
4).