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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.
Answers (1)
It is true that if the dissolved oxygen level drops to zero, the water will become septic. When this happens, many aquatic animals die because they do not get any dissolved oxygen to breathe. When sewage is discharged into a water body, microorganisms feed on organic impurities. In this process, they consume most of the oxygen present in water. This reduces the level of dissolved oxygen to negligible level.
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