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Water pollution refers to the degradation of water quality due to the introduction of physical, chemical, and biological pollutants that make water unfit for its intended uses. In the context of hydrology and water resources, understanding the nature of pollutants and their impacts is essential for sustainable water management. Various pollutants contaminate surface water and groundwater, originating from natural processes as well as human activities such as industrialization, agriculture, and urbanization. One major category of water pollutants is organic pollutants, which include domestic sewage, animal waste, and biodegradable industrial effluents. These substances increase the biochemical oxygen demand of water bodies, leading to depletion of dissolved oxygen. As a result, aquatic organisms such as fish and invertebrates __________ ___ ___ _____ ___ ______ ______.
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