character: Ms. Thompson
topic: The Impact of pH Levels on Freshwater Ecosystems
grade: 9
subject: Chemistry
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character: Mr. Johnson
topic: Acidic and Alkaline Substances in Water
grade: 9
subject: Chemistry
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character: Dr. Lee
topic: Effects of Pollution on Aquatic Life
grade: 9
subject: Chemistry
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character: Ms. Garcia
topic: The Role of Biodiversity in Freshwater Health
grade: 9
subject: Chemistry
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