character: Energy Flow in Ecosystems
topic: Producers, Consumers, and Decomposers
grade: 11
subject: Science
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character: Biological Energy Transfer
topic: Trophic Levels
grade: 11
subject: Science
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character: Autotrophs and Heterotrophs
topic: Roles in the Ecosystem
grade: 11
subject: Science
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character: Nutrient Cycling
topic: Relation to Energy Flow
grade: 11
subject: Science
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