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2. How much carbon dioxide is in the air?

  • 0.035%.
  • 0.039%.
  • 11.35%.

3. How much oxygen is in air?

  • 21%.
  • 56%.
  • 76%.

4. What does a catalytic converter do?

  • It converts sulfur dioxide to carbon dioxide form engines of vehicles.
  • It removes carbon monoxides of nitrogen from car fuses and converts them to carbon dioxide.
  • It converts carbon dioxide to carbon monoxide from the engine of a car.

5. How much water vapour is in the air?

  • There isn't any.
  • A varying amount.
  • A not known amount.
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