character: Professor John Greenfield
topic: Fertilizer Impact on Soil Health
grade: 9
subject: Science
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character: Dr. Lisa Harmon
topic: Soil Microorganisms and Nutrient Cycling
grade: 9
subject: Science
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character: Dr. Mark Tilling
topic: Organic vs. Chemical Fertilizers
grade: 9
subject: Science
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character: Ms. Sarah Green
topic: Soil Erosion and Conservation Practices
grade: 9
subject: Science
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