character: Ms. Chen
topic: Chemical Contaminants in Freshwater Habitats
grade: 10
subject: Science
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character: Mr. Smith
topic: Impact of Pollutants on Aquatic Life
grade: 10
subject: Science
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character: Dr. Lee
topic: Water Quality Assessment Techniques
grade: 10
subject: Science
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character: Ms. Patel
topic: Ecosystem Effects of Nutrient Runoff
grade: 10
subject: Science
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