[MCAT Question of the Day, Click Display Images To See] + Join us on Facebook<https://mcatquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=051cd6b816&e=61d7ba7392> + Connect on Twitter<https://mcatquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=c4cd55ee29&e=61d7ba7392> Primitive Atmosphere According to scientists, Oparin and Haldane, which of the following gases were present in the primitive atmosphere?? A. CH4, NH3, H2, H2O B. CO2, NH3, H2, H2O C. N2, O2, H2, H2O D. CH4, NH3, O2, H2O To see the answer to today's question, visit the following link: http://mcatquestionoftheday.com/biology/primitive-atmosphere/<https://mcatquestionoftheday.us4.list-manage.com/track/click?u=d3318065969b7c08ead5d4c4d&id=9bff581dc0&e=61d7ba7392>