The process by which a clean water body changes to an algae-filled state and then to an oxygen-deficient one is known as .

eutrophication

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biomagnification

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contamination

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photosynthesis

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Solution

The correct option is A eutrophication
The process by which a clean water body changes to an algae-filled state and then to an oxygen-deficient state is known as eutrophication. In this process, organisms metabolise the organic wastes and release gases such as methane and hydrogen sulfide, which are harmful to aquatic life.

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