character: Carbon Dioxide Concentration
topic: Importance for Plant Survival
grade: 9
subject: Science
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character: Photosynthesis
topic: Role of Carbon Dioxide in Plant Growth
grade: 9
subject: Science
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character: Atmospheric Gases
topic: Impact of CO2 Levels on Ecosystems
grade: 9
subject: Science
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character: Climate Change
topic: Effects of Increased CO2 on Plant Life
grade: 9
subject: Science
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