character: Soil Scientist Sam
topic: Nutrient Cycling in Soil
subject: Science
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character: Dr. Earthworm Ed
topic: Role of Soil Organisms in Nutrient Cycling
subject: Science
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character: Professor Plant
topic: Photosynthesis and Soil Nutrients
subject: Science
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character: Nate the Nutrient
topic: Essential Nutrients for Plant Growth
subject: Science
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