Eutrophication results in the reduction of

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(B) Eutrophication is the process where water bodies become enriched with nutrients,typically $N$ and $P$,leading to excessive growth of algae (algal

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Dissolved oxygen

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(B) Eutrophication is the process where water bodies become enriched with nutrients,typically $N$ and $P$,leading to excessive growth of algae (algal bloom).These algal blooms cover the surface of the water,preventing sunlight from reaching submerged plants.As the algae die,decomposers like bacteria consume the organic matter,using up a large amount of the $O_2$ dissolved in the water for respiration.This leads to a significant decrease in the levels of dissolved oxygen,which negatively impacts aquatic life such as fish and other organisms.

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