character: Yeast
topic: Carbon Dioxide Production in Fermentation
grade: 9
subject: Science
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character: Plants
topic: Photosynthesis and Respiration
grade: 9
subject: Science
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character: Microorganisms
topic: Cellular Respiration and Gas Exchange
grade: 9
subject: Science
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character: Environment
topic: Impact of CO2 on Climate Change
grade: 9
subject: Science
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