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Water pollution refers to the contamination of water bodies such as rivers, lakes, oceans, and groundwater by harmful substances, which adversely affect human health, aquatic life, and the environment. It occurs due to the introduction of pollutants like chemicals, heavy metals, plastics, sewage, and agricultural runoff into water systems. Industrial effluents, untreated domestic sewage, and excessive use of fertilizers and pesticides ____ ______ _____ ____ _________ _______ ________ __________ ______ ________.
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