The Basic Chemical Molecules Thought to Have Been Present in Abundance

Multiple Choice

The basic chemical molecules thought to have been present in abundance in the early planetary system,which were used in the classical Urey-Miller 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) .