Origin of life

Miller-Urey Experiment

         The origin of life, probably the most spoken subject ever since the beginning of human wisdom. Since the beginning of human existence we have always wondered about the origin of life. Some have tried to explain the origin of life through illogical reasoning such as biblical theories. However, if you are simply a logical person you will not be able to accept this because it has no factual evidence. A number of experimental investigations have provided evidence of how life began on planet Earth. For example the Miller-Urey experiment, this experiment showed that organic compounds could be synthesized from inorganic precursors. This also follows the hypothesis of the "organic soup" model which hypothesized that the primitive atmosphere contained inorganic precursor from which organic molecules could have been synthesized through natural chemical reaction catalyzed by the input of energy.
        

The Murchison meteorite may be a fragment of a comet. It contains ancient grains that formed in stars long before the solar system was formed. Also present are organic molecules such as amino acids — the building blocks of life — that may provide clues to the origins of life.  

          There are also many other hypotheses about the natural origin of life on earth, which mostly have scientific factual evidence. For instance, a meteor seeding earth with organic molecules from space.This hypothesis came about because a meteorite hit Australia in 1969 and is very rich in organic compounds, including 70 amino acids and nucleotide bases. Which are extremely vital for life, especially when our physiological proteins consist of 20 different amino acids. So this lead to scientist hypothesize that a meteor hit earth 4.6 billion years ago and from these simple molecules came about more complex molecules.The monomers produced polymers with the ability to replicate, store and transfer information. 
    
        Many scientist believe that earth formed 4.6 billion years ago but the environment was way to harsh for life because of the lack of oxygen, numerous amounts of volcanoes, and etc. Only until 3.9 bya do scientist believe that life actually formed on earth. The earliest fossil record evidence can be dated back to 3.5 bya. With this evidence  is gives a reasonable range of when the origin of life could have occurred. Molecular and genetic evidence from extant and extinct organisms also tell scientist that all organisms share a common ancestral origin of life. A lot of evidences that scientist have found include a common genetic code.
  
        Sources: "Meteorite Sites in Victoria." : Melbourne Museum. N.p., n.d. Web. 14 Oct. 2014.

"The Miller/Urey Experiment." The Miller/Urey Experiment. N.p., n.d. Web. 12 Oct. 2014.