character: Earthworm Anatomy and Function
topic: Role of Earthworms in Soil Health
grade: 9
subject: Chemistry
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character: Soil Composition and Quality
topic: How Soil Aeration Affects Plant Growth
grade: 9
subject: Chemistry
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character: Nutrients in Soil
topic: Nutrient Release Mechanisms in Soil
grade: 9
subject: Chemistry
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character: The Nitrogen Cycle
topic: Impact of Earthworms on Soil Fertility
grade: 9
subject: Chemistry
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