character: Ms. Johnson
topic: Testing Methods for Water Quality
grade: 11
subject: Chemistry
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character: Mr. Smith
topic: Impact of pH on Water Quality
grade: 11
subject: Chemistry
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character: Dr. Brown
topic: Chemical Indicators of Water Pollution
grade: 11
subject: Chemistry
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character: Ms. Lee
topic: Aquatic Ecosystems and Water Testing
grade: 11
subject: Chemistry
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