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Question: Which of the following is a greenhouse gas?


  1.  Nitrogen
  2.  Oxygen
  3.  Ozone
  4.  Helium

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3. Ozone

Ozone is a greenhouse gas.

More info:

Carbon dioxide (CO2​), methane (CH4​), nitrous oxide (N2​O) and ozone (O3​) are the greenhouse gases present in Earth's atmosphere.

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