Explain how eutrophication can change an aquatic ecosystem into a land ecosystem? (simple 3-5 sentences)

Eutrophication (the overenrichment of aquatic ecosystems with nutrients leading to algal blooms and anoxic events) is a persistent condition of surface waters and a widespread environmental problem. Some lakes have recovered after sources of nutrients were reduced.Recycling of phosphorus from sediments enriched by years of high nutrient inputs causes lakes to remain eutrophic even after external inputs of phosphorus are decreased. 

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Ithink it is space that makes up 70 percent