character: Mr. Flow
topic: Chemical Interactions in River Hydrology
grade: 11
subject: Chemistry
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character: River Scientist
topic: Impact of Pollution on Aquatic Ecosystems
grade: 11
subject: Chemistry
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character: Water Quality Analyst
topic: Chemical Properties of Freshwater Sources
grade: 11
subject: Chemistry
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character: Ecologist
topic: Effects of Nutrients on Water Chemistry
grade: 11
subject: Chemistry
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