character: Ms. Sarah Johnson
topic: Introduction to Environmental Chemistry
grade: 9
subject: Chemistry
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character: Mr. David Lee
topic: Fundamentals of Green Chemistry
grade: 9
subject: Chemistry
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character: Dr. Emily Carter
topic: Impact of Pollution on Ecosystems
grade: 9
subject: Chemistry
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character: Ms. Linda Thompson
topic: Chemical Reactions in Nature
grade: 9
subject: Chemistry
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