character: Ms. Emily Johnson
topic: Understanding Water Contaminants and Their Effects
grade: 11
subject: Chemistry
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character: Mr. David Carter
topic: Chemical Properties of Water and Contaminants
grade: 11
subject: Chemistry
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character: Dr. Sarah Parker
topic: Impact of Water Pollution on Ecosystems
grade: 11
subject: Chemistry
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character: Mrs. Lisa Chen
topic: Methods for Water Purification and Treatment
grade: 11
subject: Chemistry
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