Fish Need Oxygen Too!

Today we had to test how much oxygen was in a fish tank with fish in it and another one just with sea-weed in the fish tank. The groups hypothesis was that that the tank with just sea-weed would produce more oxygen than the tank with fish. The reason why the group pick the one with just sea-weed because, plants let off oxygen. After doing the oxygen test we figured ou the one with fidh in it produced more oxygen. We figured out that the reason the fish tank with fish produced more oxygen because, there was an pump in the tank.