The respiratory system and cellular respiration have oxygen in common because: Oxygen plays vital roles in both systems.
Oxygen plays an important role in both systems
Respiratory system comprises of organs such as the lungs, blood vessels, airways which enable you to breathe in oxygen and also give out carbon dioxide.
Oxygen is key to the respiratory system as all organs and vessels associated with is works in getting oxygen to the cells of the body, and also giving off carbon dioxide.
In same vein, cellular respiration makes use of oxygen during the breakdown of glucose to release energy as well as carbon dioxide and water.
See attachment for the diagram showing a a simple equation of cellular respiration involving oxygen.
In conclusion, the respiratory system and cellular respiration have oxygen in common because: Oxygen plays vital roles in both systems.
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