character: Doc
topic: Hemoglobin Function
grade: 6
subject: Health Education
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character: Blood Cells
topic: Role of Red Blood Cells in Oxygen Transport
grade: 6
subject: Health Education
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character: Oxygen Molecule
topic: How Oxygen is Transported in the Body
grade: 6
subject: Health Education
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character: Carbon Dioxide
topic: Role of Hemoglobin in Carbon Dioxide Transport
grade: 6
subject: Health Education
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