character: Mr. John Smith
topic: Nutrient Cycles and Soil Composition
grade: 12
subject: Chemistry
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character: Ms. Emily Johnson
topic: Environmental Impact of Soil Nutrients
grade: 12
subject: Chemistry
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character: Dr. Lisa Wang
topic: Chemical Properties of Soil Components
grade: 12
subject: Chemistry
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character: Mr. Michael Brown
topic: Role of Nutrients in Ecosystems
grade: 12
subject: Chemistry
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