character: Ms. Sarah Johnson
topic: Water Quality Indicators and Analysis
grade: 12
subject: Chemistry
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character: Dr. Emily Carter
topic: Impact of Water Pollution on Ecosystems
grade: 12
subject: Chemistry
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character: Mr. David Lee
topic: Chemical Tests for Water Quality Assessment
grade: 12
subject: Chemistry
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character: Ms. Rachel Green
topic: Waterborne Diseases and Chemical Contaminants
grade: 12
subject: Chemistry
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