The primary source of organic pollution in fresh water bodies is (A) run-off urban areas (B) run-off from agricultural forms (C) sewage effluents (D) industrial effluents

The primary source of organic pollution in fresh water bodies is (A) run-off urban areas (B) run-off from agricultural forms (C) sewage effluents (D) industrial effluents
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Answer :

(C) sewage effluents
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