character: Ms. Greenfield
topic: Types of Soil and Their Properties
grade: 9
subject: Biology
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character: Mr. Thompson
topic: Soil Composition and Nutrients
grade: 9
subject: Biology
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character: Dr. Harris
topic: The Role of Soil in Ecosystems
grade: 9
subject: Biology
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character: Ms. Rivera
topic: Soil Erosion and Conservation Techniques
grade: 9
subject: Biology
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