What are the two forms of oxygen found in the atmosphere?

  • A
    Elemental oxygen $(O_2)$ and Ozone $(O_3)$
  • B
    Atomic oxygen $(O)$ and Ozone $(O_3)$
  • C
    Elemental oxygen $(O_2)$ and Atomic oxygen $(O)$
  • D
    Ozone $(O_3)$ and Carbon dioxide $(CO_2)$

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List any three human activities which would lead to an increase in the carbon dioxide content of air.

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Name two biologically important compounds that contain both oxygen and nitrogen.

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