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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Nitrates and phosphates

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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. As the lake's fertility increases,plant and animal life burgeons,and organic remains begin to be deposited on the lake bottom. The addition of domestic sewage and agricultural runoff significantly increases the concentration of nitrates and phosphates,accelerating this process. This excessive nutrient enrichment leads to high productivity,which is known as eutrophication.

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