character: Professor Greenfield
topic: The Role of Soil in Ecosystem Services
subject: Science
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character: Dr. Jones
topic: Soil Degradation and Its Impact on Ecosystems
subject: Science
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character: Ms. Reynolds
topic: Soil and Water Conservation Techniques
subject: Science
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character: Mr. Davis
topic: The Importance of Soil Microorganisms in Nutrient Cycling
subject: Science
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