Chemistry 0620 · IGCSE · Air quality and climate

Air quality and climate — practice question

Which statement concerning the carbon cycle is correct?

  • ACarbon is absorbed from the atmosphere by combustion and released into it by respiration.
  • BCarbon is absorbed from the atmosphere by photosynthesis and released into it by combustion.
  • CCarbon is absorbed from the atmosphere by both respiration and combustion.
  • DCarbon is released into the atmosphere by both photosynthesis and respiration.

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