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primitive chemical
Origin of Life:: A. Chemogeny (Chemical Evolution) B. Biogeny (Formation of Primitive Life) C. Cognogeny (Nature of Primitive Life and Its Evolution).
Modern Theory of Origin of Life was proposed by a Russian biochemist, Alexander I. Oparin (1923 A.D.) and was supported by a British scientist, It stated that primitive life originated in the water bodies on the primitive earth from non-living organic molecules (e.g., RNA proteins, etc.)