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character: Urie Bronfenbrenner
topic: Ecological Systems Theory
grade: 9
subject: Biology
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character: Elton C. Dickerson
topic: Trophic Levels and Ecosystem Dynamics
grade: 9
subject: Biology
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character: Charles Elton
topic: Food Webs and Trophic Levels
grade: 9
subject: Biology
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character: Raymond L. Lindeman
topic: Trophic Dynamic Concept
grade: 9
subject: Biology
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