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Origin and Evolution of Life

  • Origin of life
    • Evolutionary biology is the field of science that deals with the study of evolutionary development of life forms on earth
    • Big-bang theory explains the origin of the universe.
    • Scientists believed that life originated through chemical evolution.
    • Formation of biomolecules → First life form
    • According to Oparin and Haldane, the primitive atmosphere was reducing as it lacked oxygen. The atmosphere was rich in methane, water vapour, ammonia and carbon dioxide. 
    • The temperature was high and volcanic eruptions were frequent.
    • Urey and Miller experimentally confirmed that formation of life was preceded by c…

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