character: Arterial Andy
topic: Structure and Function of Arteries
grade: 9
subject: Science
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character: Cardio Carla
topic: Functions of the Circulatory System
grade: 9
subject: Science
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character: Blood Vessel Benny
topic: Types of Blood Vessels
grade: 9
subject: Science
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character: Oxygen Olivia
topic: Oxygen Transport in the Blood
grade: 9
subject: Science
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