character: Professor Ocean
topic: The Role of Oxygen Levels in Aquatic Environments
grade: 9
subject: Biology
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character: Dr. Waters
topic: Impact of Dissolved Oxygen on Fish Populations
grade: 9
subject: Biology
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character: Captain Coral
topic: Effects of Low Oxygen on Marine Ecosystems
grade: 9
subject: Biology
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character: Professor Tide
topic: Oxygen Dynamics in Freshwater vs. Saltwater
grade: 9
subject: Biology
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