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character: Oxygen the Byproduct
topic: Importance of Oxygen in the Environment
grade: 4
subject: Science
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character: The Role of Plants
topic: How Photosynthesis Produces Oxygen
grade: 4
subject: Science
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character: The Oxygen Cycle
topic: Understanding How Oxygen Moves Through the Environment
grade: 4
subject: Science
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character: Human Dependence on Oxygen
topic: Why We Need Oxygen to Survive
grade: 4
subject: Science
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