The gases present in the primitive atmosphere were:

  • A
    $CH_4, NH_3, H_2, H_2O$ (in vapor form)
  • B
    $CH_4, NH_3, CO_2, H_2O$ (in vapor form)
  • C
    $CH_4, H_2O, CO_2$
  • D
    $CH_4, O_2, CO_2$

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