character: Ms. Oxygen
topic: Gas Exchange in the Lungs
grade: 9
subject: Biology
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character: Dr. Carbon Dioxide
topic: Role of Carbon Dioxide in Respiration
grade: 9
subject: Biology
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character: Professor Hemoglobin
topic: Transport of Oxygen in the Blood
grade: 9
subject: Biology
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character: Ms. Alveoli
topic: Structure and Function of Alveoli
grade: 9
subject: Biology
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