character: Photosynthetic Organisms in Ecosystems
topic: Role in Aquatic Ecosystems
grade: 6
subject: Geography
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character: Aquatic Plants
topic: Contributions to Oxygen Production
grade: 6
subject: Geography
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character: Phytoplankton
topic: Primary Producers in Oceanic Food Chains
grade: 6
subject: Geography
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character: Coral Reefs
topic: Symbiosis with Algae in Marine Environments
grade: 6
subject: Geography
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