A 3-hectare lake in the American Midwest suddenly has succumbed to an algal bloom. What is the likely cause of eutrophication in freshwater ecosystems, such as this one?

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Ecosystem restoration is the process of helping an ecosystem recover after it has been damaged, destroyed, or degraded. Ecosystems are dynamic communities of plants, animals, and microorganisms that interact with their physical environment as a functional unit.

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A 3-hectare lake in the American Midwest suddenly has succumbed to an algal bloom. What is the likely cause of eutrophication in freshwater ecosystems, such as this one?