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character: Nutrient Cycling
topic: Role of Earthworms in Soil Fertility
grade: 9
subject: Biology
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character: Earthworm Biology
topic: Importance of Earthworms in Ecosystems
grade: 9
subject: Biology
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character: Soil Composition
topic: Effects of Earthworm Activity on Soil Structure
grade: 9
subject: Biology
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character: Soil Fertility
topic: Detrimental Effects of Soil Degradation
grade: 9
subject: Biology
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