Which of the following was most likely to have been absent in free form in the primordial atmosphere at the time of origin of life

  • A
    ${O_2}$
  • B
    $C{H_4}$
  • C
    ${H_2}$
  • D
    $N{H_3}$

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Definitions / Explanation : Theory of spontaneous generation / Abiogenesis & Proteinoids