Explanation

The first experimentalsupport to Oparin-Haldane’s theory of origin of life came from Urey and Stanley Miller’s experiment in 1953. He built an apparatus of glass tubes and flasks in the laboratory. He created an atmosphere containing hydrogen${\ (H}_{2}),\ \mathbf{ammonia}\left( NH_{3} \right),\ \mathbf{methane}\left( CH_{4} \right)\ and\ \mathbf{water\ vapours\ }\left( H_{2}O \right)$ in one large flask and allowed condensed liquids to accumulate in another small flask. The ratio of methane, ammonia and hydrogen in large flask was 2 : 1 : 2.