character: Red Blood Cells
topic: Functions of Red Blood Cells in the Circulatory System
grade: 9
subject: Science
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character: Hemoglobin
topic: Role of Hemoglobin in Oxygen Transport
grade: 9
subject: Science
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character: Circulatory System
topic: Overview of Circulatory System Components
grade: 9
subject: Science
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character: Anemia
topic: Effects of Low Red Blood Cell Count on Health
grade: 9
subject: Science
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