character: Ecosystem Engineer
topic: Role of Roots in Soil Retention
grade: 9
subject: Science
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character: Plants
topic: Impact on Soil Erosion
grade: 9
subject: Science
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character: Earthworms
topic: Contribution to Soil Structure
grade: 9
subject: Science
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character: Beavers
topic: Creating Wetland Ecosystems
grade: 9
subject: Science
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