Multiple choice Miller synthesised simple amino acids form water vapours and mixtures containing H2, O2, N2 (1 : 2 : 1) H2, O2, N2 (2 : 1 : 2) CH4, NH3, H2 (2 : 1 : 2) CH4, NH3, H2 (1 : 2 : 1) Reveal answer Fill a bubble to check yourself D Correct answer Explanation The correct option is 4.