Question

What was proposed by Oparin and Haldane on the origin of life? How did S.L. Miller's experiment supports their proposal?

Answer 1

Oparin and Haldane had confidence in life's chemical evolution. They suggested that pre-existing non-organic molecules, S.L., may have produced the first form of life. In a closed flask containing CH$_4$, H$_2$, NH$_3$ and water vapour, Miller produced an electrical discharge at 800$^\circ$ C.

Complete step by step answer:
In 1992, JBS Haldane and Aleksandr Oparin independently suggested a life-origin hypothesis that in the presence of an external energy source, organic molecules could be produced from abiogenic material.
Then in 1953, the Oparin-Haldane hypothesis was tested by Harold C Urey and Stanley Miller and organic molecules were successfully developed from some of the inorganic components thought to be present on prebiotic Earth. They mixed hot water with a mixture of four gases-water vapor, methane, ammonia and molecular hydrogen-and electric discharge pulsed the "atmosphere."

Additional information: The Oparin Haldane hypothesis was suggested by Oparin and Haldane. The chemical evolution of life was suggested by it. The first life form came from pre-existing non-organic molecules, according to this theory. Ltd. S.L. Miller endorsed their suggestion. During the early days of creation, he established the decreasing atmosphere of Earth. In a closed flask containing methane, hydrogen, ammonia and water vapour at 800 $^\circ$C, he developed an electrical discharge.

Note: The hypothesis of Oparin-Haldane suggests that life originated gradually from inorganic molecules, first forming "building blocks" such as amino acids and then combining to make complex polymers. The RNA universe hypothesis, which implies that the first life was RNA self-replicating, is backed by some scientists.