character: Nutrient Ninja
topic: Essential Nutrients for Strong Bones
grade: 9
subject: Science
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character: Calcium Crusader
topic: Role of Calcium in Bone Health
grade: 9
subject: Science
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character: Vitamin D Dynamo
topic: Importance of Vitamin D for Calcium Absorption
grade: 9
subject: Science
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character: Bone Builder
topic: How Nutrition Affects Bone Density
grade: 9
subject: Science
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