Which of the following does not cause water pollution?

Addition of mercury salts to water body

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Addition of fertilizers to water body

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Addition of disease-causing bacteria to water body

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Addition of dissolved oxygen to water body

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Solution

The correct option is D
Addition of dissolved oxygen to water body

Adding dissolved oxygen is not considered to be water pollution since dissolved oxygen is essential to the aquatic plants and animals. Removal of dissolved oxygen would constitute water pollution.

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