Chemistry 0620 · IGCSE · Air quality and climate

Air quality and climate — practice question

The carbon cycle is illustrated in a diagram. Which processes are shown by the letters W, X and Y?

  • AW photosynthesis; X combustion; Y respiration
  • BW photosynthesis; X respiration; Y combustion
  • CW respiration; X combustion; Y photosynthesis
  • DW respiration; X photosynthesis; Y combustion

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