character: Photosynthesis
topic: Cyanobacteria's Role in Oxygen Production
subject: Science
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character: Cyanobacteria
topic: Oxygen Production in Aquatic Ecosystems
subject: Science
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character: Nutrient Cycling
topic: Importance of Cyanobacteria in Ecosystem Health
subject: Science
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character: Photosynthetic Organisms
topic: Role in Earth's Oxygen Levels
subject: Science
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