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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  17. The waste product In the urine of man is
  18. Human blood is oxygenated and purified in the
  19. Biologists have so far known, found and identified a large number of species in the plant and animal…
  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
  23. Vitamin D deficiency leads to
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  25. Compared to the veins, the walls of arteries are
  26. Rh+ blood is due to genes which are
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