The basic chemical molecules thought to have been present in abundance in the early planetary system, which were used in the classical Miller-Urey laboratory experiments in which complex compounds essential to life were formed by electric discharges, were
A) CO2 (carbon dioxide) , H2O (water) , and H2 (hydrogen) .
B) H2 (hydrogen) , O2 (oxygen) , and CO2 (carbon dioxide) .
C) CH4 (methane) , NH3 (ammonia) , H2O (water) , and H2 (hydrogen) .
D) H2 (hydrogen) , He (helium) , Ar (argon) , and Ne (neon) .
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