character: Professor River
topic: Freshwater Systems and Their Functions
grade: 9
subject: Science
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character: Aquatic Biologist
topic: Ecosystems in Freshwater Habitat
grade: 9
subject: Science
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character: Environmental Scientist
topic: Impact of Pollution on Freshwater Bodies
grade: 9
subject: Science
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character: Hydrologist
topic: Water Cycle and Freshwater Systems
grade: 9
subject: Science
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