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As explained in our Hereditary and Evolution Lesson class, our ma'am told that if we see our composition that is what are we made up of then the main materials are:- Carbon, Hydrogen, Oxygen and Nitrogen. So, comparing our composition with non-living materials; we are connected to them also. So it is believed that life on earth came up due small variations that got accumulated lead the way to the existence of Human Beings. 

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Yours, B.Jahnavi

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With the help of mainly water and oxygen.
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