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When the earth was formed it had an atmosphere with

A. Hydrogen, Oxygen and Nitrogen

B. Water Vapour, Hydrogen and Oxygen

C. Oxygen, Carbondioxide and Nitrogen

D. Water Vapour, Ammonia and Methane

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  20. Leafy trees help in preventing
  21. Which hormone is secreted when there is a rise in the blood glucose level?
  22. The blood pressure is controlled by the hormone
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