Which one of the following was probably absent in the atmosphere at the time of origin of life?

A. Ammonia

B. Oxygen

C. Hydrogen

D. Carbon

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. Which among the following is the best source of proteins?
  2. The universal recipient belongs to blood group
  3. Which one of the following is essential for blood clotting?
  4. Which of the following contains the highest protein content per gram?
  5. Stripes on the bodies of animals Indicate
  6. Leaves Call off branches In the winter because of
  7. The spores of Puccinia formed on the leaves of wheat are called
  8. Which among the following is a communicable disease?
  9. Legumes are highly nutritious because they are rich in
  10. The two German scientists who proposed the 'cell theory' were
  11. The plant that is dispersed with the help of water is
  12. The buffer substance in blood is
  13. The thrombocytes are associated with
  14. Blood is
  15. Which among the following is a balanced fertiliser for plants?
  16. Vessels leaving the heart are
  17. Hormone promoting maleness in flowering plants is
  18. Sex linked genes are carried by
  19. Eosinophil™s are stained by
  20. An organism eating its own species is called
  21. The first person to observe the bacteria, protozoa and spermatozoa under the microscope was
  22. Pearl is secreted by the __________ of the pearl oyster.
  23. When one gene controls two or more different characters simultaneously, the phenomenon is called
  24. Excess of amino-acids are broken down to form urea in the
  25. The most primitive mammals are
  26. The insect vector for the disease Leishmaniasis is
  27. Blood pressure is measured by
  28. The waste product In the urine of man is
  29. The acid that is secreted in the stomach is
  30. The layer of stagnant water in which light penetrates is called