Sharp decline in dissolved oxygen, downstream from the point of sewage discharge. Choose the in...

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Sharp decline in dissolved oxygen, downstream from the point of sewage discharge.

Choose the incorrect option with respect to the above statement.
(1) Causes mortality of fishes and other organisms.
(2) Leads to growth of fishes and other organisms.
(3) There will be an increase in biological oxygen demand (BOD).
(4) Caused by increase in bacteria and other microorganisms.
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