Oparin of Russia and Haldane of England proposed prebiotic soup theory. The primordial soup is a term used to describe the aqueous solution of organic compounds that accumulated in primitive water bodies of the early earth. According to this theory, the first form of life could have come $3.8$ billion to $3.55$ billion years ago in a pond or ocean from pre-existing non-living organic molecules (that is RNA, protein, etc.) and formation of life was preceded by chemical evolutions that is formation of diverse organic molecules from inorganic constituents.