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character: Dr. Robert Paine
topic: Trophic Cascades in Ecosystems
grade: 12
subject: Biology
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character: John Krebs
topic: Keystone Species and their Role in Ecosystems
grade: 12
subject: Biology
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character: Eugene Odum
topic: Ecosystem Ecology and Energy Flow
grade: 12
subject: Biology
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character: David Schindler
topic: The Impact of Nutrient Loading on Aquatic Ecosystems
grade: 12
subject: Biology
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