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character: Oxygen Explorer
topic: Humans Need Oxygen to Breathe
grade: 4
subject: Science
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character: Oxygen Investigator
topic: How Our Bodies Use Oxygen
grade: 4
subject: Science
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character: Oxygen Helper
topic: The Role of Oxygen in Energy Production
grade: 4
subject: Science
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character: Air Buddy
topic: Why Plants and Animals Both Need Oxygen
grade: 4
subject: Science
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