character: Eutrophication
topic: Effects on Water Quality
grade: 9
subject: Biology
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character: Phosphorus Runoff
topic: Nutrient Pollution
grade: 9
subject: Biology
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character: Algal Blooms
topic: Impact on Aquatic Ecosystems
grade: 9
subject: Biology
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character: Hypoxia
topic: Oxygen Depletion in Water Bodies
grade: 9
subject: Biology
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