Abiogenesis theory proposes the idea that life arose from non-living matter more than 3.5 billion years ago on Earth. Abiogenesis proposes that the first life-forms generated were very simple and through a gradual process became increasingly complex. Biogenesis, in which life is derived from the reproduction of other life, was presumably preceded by abiogenesis, which became impossible once Earth’s atmosphere assumed its present composition.  Oparin of Russia and Haldane of England proposed that the first form of life could have come from pre-existing non-living organic molecules (e.g. RNA, protein, etc.) and that formation of life was preceded by chemical evolution, i.e., the formation of diverse organic molecules from inorganic constituents. The conditions on earth were – high temperature, volcanic storms, reducing atmosphere containing CH$$_4$$, NH$$_3$$, etc.  In 1953, S.L. Miller, an American scientist created similar conditions on a laboratory scale. He created an electric discharge in a closed flask containing CH$$_4$$, H$$_2$$, NH$$_3$$ and water vapour at 8000C. He observed the formation of amino acids. In similar experiments, others observed, the formation of sugars, nitrogen bases, pigment and fats.