Biology 0610 · IGCSE · Gas exchange in humans

Gas exchange in humans — practice question

What are the approximate percentages of oxygen and carbon dioxide found in atmospheric air?

  • Aoxygen $16\%$, carbon dioxide $4.00\%$
  • Boxygen $16\%$, carbon dioxide $8.00\%$
  • Coxygen $20\%$, carbon dioxide $0.04\%$
  • Doxygen $20\%$, carbon dioxide $4.00\%$

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