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What are the main sources of dissolved oxygen in water?

Answer 1

That would be from the atmosphere, from which oxygen would naturally dissolve into the water, and from aquatic plants, which when photosynthesizing, may release bubbles of oxygen, which as they escape may dissolved gradually into the water, though not all of it usually.

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Answer 2

Nicholas Ahn

The main sources of dissolved oxygen in water are photosynthesis by aquatic plants and algae, diffusion from the atmosphere, and mixing with oxygen-rich surface waters.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.