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Doctors Medicines MCQs Q&A

  1. Sulphur dioxide
  2. Nitrogen dioxide
  3. Carbon monoxide
  4. Methane
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Answer: Option 4

By their percentage contribution to the greenhouse effect on Earth the four major gases are: Water vapour (36-70%), Carbon dioxide (9-26%), Methane (4-9%) and Ozone (3-7%).

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