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character: Earthworm Activity
topic: Effects on Nutrient Availability in Soil
grade: 9
subject: Biology
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character: Plant Roots
topic: Interactions with Soil Microorganisms
grade: 9
subject: Biology
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character: Nutrient Cycling
topic: Role of Earthworms in Soil Fertility
grade: 9
subject: Biology
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character: Soil Composition
topic: Impact of Earthworm Densities on Plant Growth
grade: 9
subject: Biology
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