The cause of water pollution is due to

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(D) Water pollution is caused by various contaminants that degrade the quality of water. $1$. Micro-organisms like bacteria and viruses can contaminat

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All of these

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(D) Water pollution is caused by various contaminants that degrade the quality of water. $1$. Micro-organisms like bacteria and viruses can contaminate water and cause diseases. $2$. Organic wastes,such as sewage and agricultural runoff,increase the biochemical oxygen demand $(BOD)$ of water. $3$. Pesticides and fertilizers from agricultural fields leach into water bodies,causing toxicity and eutrophication. Since all these factors contribute to water pollution,the correct answer is $D$.

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