Our whole earth is full of life, whether you go deep inside ocean or up above mountains or where you are, You will find life. Even when you are taking a bite of your bread you are eating a huge colony of microorganisms. Your hand, your bed, your body, your clothes all these are covered with a huge colony of microorganisms.
Scientists contributed that, there are millions of living organisms living on the earth. But we only know about 1 millions of them.
So, come on the topic. The main question is that what is life and how it came into existence. Many people thinks that life is started with magic. But they really think about magic in this era of science and technology. But still science can not able to explain everything about the starting of life. But life is same as all the thing in this universe, means it must obey the laws of the universe. Organisms are just a collection of molecules arranged in a unique way which make an organism functional. When we go deep and study about the function of a cell then we found how it obey the laws of the universe.
Darwin's theory of evolution tells about how life evolved from a single cell (unicellular) organism to multicellular organism. And the Mendel's experiment tells us about the mechanism of inheriting the traits from one generation to next generation. But none of them could able to explain about the beginning of the life on the earth.
Then, J.B.S. Haldane, a British scientist, suggested that life originated from the simple inorganic molecules such as ammonia, methane and hydrogen sulphide which were present on the earth soon after it was formed. It is known as the 'naturalistic theory' or ' The theory of chemical origin of life. It states that the conditions on the earth at that time could have transformed simple inorganic molecules into complex organic molecules they were necessary for life. But Haldane only suggested this phenomena.
Finally, Stanley L. Miller and Harold C. Urey in 1953 confirmed the theory of life proposed by Haldane. And this experiment is known as 'Miller and Urey experiment.
● Miller and Urey assembled an apparatus by creating an atmosphere that was similar to the early atmosphere on the earth.
● The apparatus consisted of gases like methane, ammonia and hydrogen sulphide but no oxygen over water.
● The apparatus was maintained at a temperature just below the 100℃ and electric spark were passes through the mixture of gases to simulate lighting.
● Finally, at the end of a week, 15% of the carbon (from methane- CH4 ) had been converted to simple carbon compounds including amino acids made up of protein molecules in living organisms.
Finally, the experiment provided the evidence that the life originated from the inorganic molecules.
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5 Comments

Arush Agarwal said…
Very nice article, it will be really helpful for Scholarship for Engineering Students in India.
world knowledge said…
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world knowledge said…
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Essay said…
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Avinash Kumar said…
Great article thanks for sharing this great article
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