character: CO2 Levels
topic: Atmospheric carbon dioxide trends
grade: 9
subject: Biology
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character: Climate Change
topic: Impact of CO2 on global temperatures
grade: 9
subject: Biology
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character: Photosynthesis
topic: Role of CO2 in plant growth
grade: 9
subject: Biology
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character: Greenhouse Gases
topic: Comparison of CO2 with other greenhouse gases
grade: 9
subject: Biology
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