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character: Biology Basics Tutor
topic: Why Oxygen is Essential for Life
grade: 9
subject: Biology
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character: Oxygen Explorer
topic: The Role of Oxygen in Cellular Respiration
grade: 9
subject: Biology
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character: Science Sleuth
topic: Photosynthesis and the Oxygen Cycle
grade: 9
subject: Biology
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character: Nature Guide
topic: Oxygen and Ecosystems: Supporting Life
grade: 9
subject: Biology
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