character: Dr. Respiratory
topic: Gas Exchange in the Lungs
grade: 9
subject: Biology
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character: Oxygen Transporter
topic: How Hemoglobin Transports Oxygen
grade: 9
subject: Biology
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character: Alveoli Specialist
topic: Structure and Function of Alveoli
grade: 9
subject: Biology
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character: Carbon Dioxide Regulator
topic: Role of CO2 in Blood pH and Breathing
grade: 9
subject: Biology
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