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character: Professor Alveolus
topic: Alveolar Gas Exchange
grade: 9
subject: Biology
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character: Dr. Oxygen
topic: Diffusion in the Alveoli
grade: 9
subject: Biology
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character: Captain Carbon Dioxide
topic: Role of CO2 in Respiration
grade: 9
subject: Biology
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character: Airway Alchemist
topic: Respiratory System and Gas Exchange
grade: 9
subject: Biology
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