Scientists lack enough evidence to conclude how the first organic molecules formed or arrived on
Earth. However, the results of the Miller-Urey experiment and related experiments support which of
these mechanisms for organic molecule synthesis?

As the first cells formed, they released urea and other organic wastes into the surrounding water

During a volcanic eruption, gases from Earth's interior reacted with one another to form amino
acids,

During a lightning strike, chemicals in the atmosphere reacted to form amino acids.

As Earth cooled, amino acids and other compounds fell to the surface in raindrops.