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:

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The Urey-Miller laboratory experiments were designed to simulate the conditions of the early Earth, and the basic chemical molecules thought to have been present in abundance during that time included methane (CH₄), ammonia (NH₃), water (H₂O), and hydrogen (H₂). These molecules were subjected to electric discharges in the experiment, leading to the formation of complex compounds such as amino acids, which are essential building blocks of life. Options A, B, and D are incorrect because they do not include all the necessary molecules used in the experiments or include molecules that were not thought to be present in the early Earth's atmosphere.

The Basic Chemical Molecules Thought to Have Been Present in Abundance