character: Mr. Kim
topic: Effects of Water Pollutants on Ecosystems
grade: 9
subject: Science
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character: Mr. Lee
topic: Impact of Industrial Waste on Aquatic Life
grade: 9
subject: Science
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character: Ms. Johnson
topic: The Role of Water Quality in Ecosystem Health
grade: 9
subject: Science
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character: Dr. Smith
topic: Eutrophication and Its Effects on Freshwater Ecosystems
grade: 9
subject: Science
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