Biology 9700 · AS & A Level · Transport of oxygen and carbon dioxide

Transport of oxygen and carbon dioxide — practice question

Tobacco smoke contains substances that influence the functioning of the human body. Which option correctly matches the substances with their effects?

  • Aw-1, x-2, y-3
  • Bw-1, x-3, y-2
  • Cw-2, x-1, y-3
  • Dw-3, x-1, y-2

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