AP BIOLOGY

Detailed explanation-1: -Alexander Oparin in 1924 and J. B. S. Haldane in 1929 proposed that the first molecules constituting the earliest cells slowly self-organized from a primordial soup, and this theory is called the Oparin–Haldane hypothesis.

Detailed explanation-2: -In the 1920s, the famous British biometric scientist John Haldane and Aleksandr Oparin, the Russian biochemist independently set forth similar ideas for the origin of life on Earth.

Detailed explanation-3: -The origin of primordial life In the 1920s the Russian biochemist Aleksandr Oparin and other scientists suggested that life may have come from nonliving matter under conditions that existed on primitive Earth, when the atmosphere consisted of the gases methane, ammonia, water vapour, and hydrogen.

Detailed explanation-4: -Assertion: Oparin and Haldane proposed that the first form of life could have come from pre-existing non-living organic molecules.

Detailed explanation-5: -The Miller-Urey Experiment Stanley Miller and Harold Urey proved how organic life could spontaneously arise from inorganic molecules in the conditions described by Haldane and Oparin.