Is it true that, if the dissolved oxygen level drops to zero,

Is it true that, if the dissolved oxygen level drops to zero, the water will become septic? Give an example which could lower the dissolved oxygen content of an aquatic body.

Yes, it is true. In case of zero level of Dissolved Oxygen - (DO), the water becomes septic. Organic pollutants like fertiliser in aquatic bodies are responsible for lowering (upto zero) the level of dissolved oxygen.

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