Eutrophication is caused by

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(B) Eutrophication is the natural aging of a lake by nutrient enrichment of its water. In a young lake,the water is cold and clear,supporting little l

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Sewage and detergents

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(B) Eutrophication is the natural aging of a lake by nutrient enrichment of its water. In a young lake,the water is cold and clear,supporting little life. With time,streams draining into the lake introduce nutrients such as nitrogen and phosphorus,which encourage the growth of aquatic organisms. Human activities,such as the discharge of sewage and detergents,significantly accelerate this aging process,a phenomenon known as cultural or accelerated eutrophication. These pollutants lead to excessive growth of algae,which depletes dissolved oxygen and harms aquatic life.

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