character: Dr. Bonebuilder
topic: How Calcium Supports Bone Density
grade: 9
subject: Science
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character: Osteo the Owl
topic: Understanding Bone Health
grade: 9
subject: Science
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character: Calci the Calcium
topic: The Role of Minerals in Bones
grade: 9
subject: Science
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character: Professor Osteon
topic: Factors Affecting Bone Density
grade: 9
subject: Science
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