character: Professor Stream
topic: Effects of Runoff on Freshwater Species
grade: 9
subject: Science
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character: Dr. Waters
topic: Pollution and Its Impact on Aquatic Ecosystems
grade: 9
subject: Science
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character: Ms. Green
topic: Biodiversity in Freshwater Habitats
grade: 9
subject: Science
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character: Mr. Flow
topic: Nutrient Runoff and Algal Blooms
grade: 9
subject: Science
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