Dissolved Oxygen and Carbon Cycle.
Two sources of dissolved oxygen would be the oxygen from the plants in the water and the oxygen and its contact with the atmosphere. During the day the oxygen levels rise (because photosynthesis occurs with sunlight) and the carbon dioxide levels decrease as the plants absorb it. During the night carbon dioxide increases while oxygen decreases. This is because their is no sunlight to create photosynthesis, and therefore oxygen. However, the plants instead of producing oxygen, absorb it and produce carbon dioxide.
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