character: Ms. Sarah Lee
topic: Chemical Properties of Common Water Pollutants
grade: 12
subject: Chemistry
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character: Mr. John Smith
topic: Impact of Nitrogen and Phosphorus on Water Quality
grade: 12
subject: Chemistry
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character: Dr. Emily Wong
topic: Heavy Metals in Water: Sources and Effects
grade: 12
subject: Chemistry
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character: Ms. Rachel Green
topic: Organic Pollutants: Toxicity and Breakdown in Aquatic Systems
grade: 12
subject: Chemistry
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