By P.C. Trivedi

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They divide either by binary fission or by budding. -¢- On these basis it is assumed that microsphere like aggregates could have been the fore runners of first living organism. Thus they provide an excellent model for protocells because: -¢- Microsphere originated from protenoid produced under conditions existing on the primitive earth. They show structural and functional attributes of contemporary cells. Step-3 : Formation of Nucleic Acids The next step was formation of nucleic acids by the polymerization of nucleotides.

As the earth was formed by the condensation of nebular mass, its temperature increased due to internal pressure, gravitation and effect of solar heating. Thus initially the earth was a fiery spinning ball of hot gases and vapours of various elements. Through hundreds, millions years, the gases condensed into a molten core and different elements got stratified according to their density. The heavy elements like iron and nickel etc. sank to the centre and formed solid core of the earth, the lighter elements like silicon and aluminum rose to the surface and solidified to form the surface or crust.

B) Viol~nt electric discharge followed with lightening and thunder from clouds reached the primitive earth and contributed Significantly to form various micro and macro-molecules. (c) Volcano eruptions produced heat which also encouraged chemical reactions. e. x - rays etc also provided energy for chemical evolution. (B) CHEMICAL ORIGIN OF LIFE (CHEMOGENY) Life did not originate at one specific spot at one specific time in the early oceans of earth. Oparin suggested that from these simple compound viz.

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