Final answer:
The Miller-Urey experiments simulated conditions of early Earth and demonstrated that organic molecules could form.
Step-by-step explanation:
The Miller-Urey experiments simulated conditions of early Earth to demonstrate that organic molecules could form. They conducted experiments in which they exposed a mixture of ammonia, hydrogen, methane, and water to an electrical discharge simulating lightning. This produced five amino acids, which are the building blocks of proteins, and a variety of other organic compounds.