Oxygen concentration plays a role in the fish by helping them breathe. Without enough oxygen, the fish would die. However, if there is too much oxygen it could be a sign of too much algae, which hurts fish in the long run, because too much unbalance in an ecosystem is actually really harmful, in the way it will start polluting the water by blocking out sunlight and warmth and cause too many disruptions in the natural order. It can also cause diseases.
Answer: A portion of runoff enters rivers in valleys in the landscape, with streamflow moving water to the ocean.
Answer:
If all the bacteria are removed from the earth, all the organisms are negatively affected.
Explanation: There are also some beneficial bacteria which helps in the nitrogen fixation called Nitrogen fixing bacteria such as Cyanobacteria and Azotobactor. These bacteria fixes atmospheric nitrogen into ammonium and nitrates form because plants are unable to use the atmospheric nitrogen, it only use nitrogen in ammonia and nitrates form. Plants absorb nitrates and form amino acid.
