character: Mr. John Smith
topic: Oxygen Transport Mechanism
grade: 9
subject: Science
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character: Dr. Emily White
topic: Hemoglobin Function
grade: 9
subject: Science
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character: Ms. Karen Brown
topic: Respiratory System Overview
grade: 9
subject: Science
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character: Mr. Alex Green
topic: Circulatory System and Oxygen Delivery
grade: 9
subject: Science
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