How do scientists think the first organic molecules were created? Through photosynthesis By lightning sparking chemical reactions in the early atmosphere By volcanic eruptions Through nuclear fusion reactions

## Step 1<br />The question is asking about the theory that explains how the first organic molecules were created. The options provided are photosynthesis, lightning sparking chemical reactions in the early atmosphere, volcanic eruptions, and nuclear fusion reactions.<br /><br />## Step 2<br />The Miller-Urey experiment is a significant experiment in this context. This experiment simulated the conditions thought to be present on the early Earth, with a mixture of water, methane, ammonia, and hydrogen. The mixture was exposed to electrical sparks, simulating lightning, and after a week, amino acids, which are organic molecules, were found in the mixture.<br /><br />## Step 3<br />This experiment supports the theory that lightning could have sparked chemical reactions in the early atmosphere, leading to the creation of the first organic molecules. The other options, such as photosynthesis, volcanic eruptions, and nuclear fusion reactions, are not supported by this experiment.