character: Mr. Harris
topic: Impact of nutrient pollution on aquatic ecosystems
grade: 10
subject: Biology
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character: Dr. Smith
topic: Effects of runoff on freshwater habitats
grade: 10
subject: Biology
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character: Ms. Johnson
topic: Importance of balanced nutrient levels in aquatic systems
grade: 10
subject: Biology
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character: Professor Lee
topic: Long-term consequences of eutrophication in lakes
grade: 10
subject: Biology
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