character: Dr. Emily Johnson
topic: Chemical Properties of Soil Nutrients
grade: 12
subject: Chemistry
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character: Dr. Alan Smith
topic: Nutrient Cycling in Ecosystems
grade: 12
subject: Chemistry
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character: Ms. Sarah Lee
topic: Impact of Soil pH on Plant Growth
grade: 12
subject: Chemistry
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character: Prof. John Brown
topic: Role of Micronutrients in Soil Chemistry
grade: 12
subject: Chemistry
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