A) Excessive oxygen in ponds
B) Abundant fertilizers in the lake
C) The lack of algae in the lake
D) Abundant nektons in the lake
Correct Answer: B
Solution :[b] Eutrophication is the enrichment of an ecosystem with chemical nutrients, typically compounds containing nitrogen, phosphorus, or both. Eutrophication can be a natural process in lakes, occurring as they age through geological time. Negative environmental effects include the depletion of oxygen in the water, which may cause death to aquatic animals.
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