character: Hemoglobin
topic: Oxygen Transport in Red Blood Cells
grade: 9
subject: Science
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character: Oxygen
topic: Role in Cellular Respiration
grade: 9
subject: Science
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character: Red Blood Cells
topic: Structure and Function
grade: 9
subject: Science
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character: Carbon Dioxide
topic: Transport in the Blood
grade: 9
subject: Science
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