Final answer:
Stanley Miller and Harold Urey demonstrated the formation of organic molecules under conditions simulating the early Earth's atmosphere, finding amino acids, which are key components for life.
Step-by-step explanation:
The two scientists who demonstrated the creation of organic molecules in a simulated primitive atmosphere are Stanley Miller and Harold Urey. Their work assumed that the early Earth had a reducing atmosphere containing water vapor, methane, ammonia, and hydrogen. Miller and Urey sealed these gases in a sterile flask, simulating the primitive ocean and atmosphere. They then introduced electrical sparks to represent lightning, inducing chemical reactions. After a week, they analyzed the contents and discovered the presence of amino acids, which are vital building blocks of life. This experiment supported the theory of abiogenesis, suggesting that organic molecules necessary for life could have formed via natural processes on the early Earth.