character: Mrs. Brown
topic: The Effect of Metal Waste on Ecosystems
grade: 9
subject: Chemistry
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character: Dr. Smith
topic: Heavy Metals and Their Impact on Soil Quality
grade: 9
subject: Chemistry
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character: Mr. Johnson
topic: The Role of Chemistry in Environmental Cleanup
grade: 9
subject: Chemistry
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character: Ms. Lee
topic: Heavy Metal Toxicity in Aquatic Systems
grade: 9
subject: Chemistry
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