character: Nutrient Cycles
topic: The role of chemical elements in ecosystems
grade: 12
subject: Chemistry
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character: Nitrogen Cycle
topic: Importance of nitrogen in plant growth
grade: 12
subject: Chemistry
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character: Carbon Cycle
topic: Impact of carbon dioxide in ecosystems
grade: 12
subject: Chemistry
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character: Phosphorus Cycle
topic: Role of phosphorus as a limiting nutrient
grade: 12
subject: Chemistry
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