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BLOG #3 - ESSENTIAL ELEMENTS FOR LIFE ON EARTH

While scientists found evidence of simple living cells in rocks they have determined to be 3.5 billion years old, it gave them a reason to wonder: How could have life began on an irradiated, oxygen-starving Earth ? In their laboratories, they duplicated Earth's primitive atmosphere. 
               To simulate lightning and harsh sunlight, they seared gas mixtures with high voltage sparks and ultraviolet lights - forces that make and break chemical bonds. In the resulting brew, they found amino acids, the building blocks of life. Now researchers believe that the same thing happened before 3 to 4 billions years ago. 
               Another experiment showed that amino acids on a hot, dry surface-like that of a cooling rock - form cell like spheres when splashed with water. If rain washed the spheres into a tidal pool, a place safe from UV radiations, more complex molecule could form. At last, one appeared with the ability to reproduce itself. That molecule was similar to deoxyribonucleic acid(DNA), the complex organic molecule that exists today in every living cell. And with the appearance of DNA, life on earth began.
DNA Strand
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