character: Oxygen Molecules
topic: Diffusion in Blood Vessels
grade: 10
subject: Biology
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character: Hemoglobin
topic: Oxygen Transport in Blood
grade: 10
subject: Biology
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character: Capillaries
topic: Gas Exchange in the Circulatory System
grade: 10
subject: Biology
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character: Red Blood Cells
topic: Role in Oxygen Delivery
grade: 10
subject: Biology
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