Which of the following does not occur when sewage is discharged into water?
(1) Increase in O₂
(2) Cyanophycean blooms
(3) Depletion of O₂ layers
(4) Eutrophication
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Ur answers is option C
Depletion of layers donot occur with discharge of sewage in water
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3 depletion of ozone layers
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