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Water quality is influenced by a combination of physical, chemical, and biological factors that determine its suitability for human consumption, agriculture, and aquatic life. One major factor is the presence of chemical pollutants such as heavy metals, pesticides, and industrial effluents, which can alter the natural composition of water and make it toxic. Nutrient levels, especially nitrogen and phosphorus, also play a ____ ________ _____ __________ __________ ________ ____ ____ ______ ____ ________.
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