Eutrophication is observed in ...... .

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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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Freshwater lakes

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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 like algae. As the lake's fertility increases,plant and animal life burgeons,and organic remains are deposited on the lake bottom. Over centuries,as silt and organic debris pile up,the lake grows shallower and warmer,with warm-water organisms supplanting those that thrive in a cold environment. Marsh plants take root in the shallows and begin to fill in the original lake basin. Eventually,the lake gives way to large masses of floating plants (bog),finally converting into land. Therefore,eutrophication is primarily observed in freshwater lakes.

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