character: Mr. Green
topic: Photosynthesis and Its Role in the Oxygen Cycle
subject: Science
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character: Photosynthesis Process
topic: Conversion of Light Energy into Chemical Energy
subject: Science
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character: Oxygen Cycle
topic: Importance of Oxygen in Ecosystems
subject: Science
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character: Carbon Dioxide
topic: Role in Photosynthesis and Climate Change
subject: Science
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