AP BIOLOGY

Detailed explanation-1: -Working with his professor, Harold Urey, Miller designed an apparatus to simulate the ancient water cycle, together they put in water inside the apparatus to model the ancient ocean, it was gently boiled to mimic evaporation along with water vapor, for gases in the atmosphere they choose methane, hydrogen, ammonia.

Detailed explanation-2: -Miller’s experiment mimicked lightning by the action of an electric discharge on a mixture of gases representing the early atmosphere, in the presence of a liquid water reservoir, representing the early oceans.

Detailed explanation-3: -But to refresh your memory: in 1952 Stanley Miller and Harold Urey simulated the conditions of early Earth by sealing water, methane, ammonia and hydrogen in a glass flask. Then they applied electrical sparks to the mixture. Miraculously, amino acids came into existence amid the roiling mixture. It was a big deal.

Detailed explanation-4: -The two biologists made use of methane, water, hydrogen, and ammonia which they considered were found in the early earth’s atmosphere. The chemicals were sealed inside sterile glass tubes and flasks connected together in a loop and circulated inside the apparatus.