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The concept of chemical evolution refers to the hypothesis that life on Earth originated through a gradual chemical process in which simple inorganic molecules combined to form complex organic compounds. These organic compounds eventually gave rise to the first primitive forms of life. This idea is central to the theory of abiogenesis, which proposes that life emerged from non-living matter under the influence of physical and chemical processes operating on the primitive Earth. According to the theory of chemical evolution, the early Earth, formed about 4.6 billion years ago, had a very different atmosphere compared to today. The primitive atmosphere is believed to have been reducing in nature, composed mainly of methane (CH₄), ammonia (NH₃), hydrogen (H₂), and water vapour (H₂O), with little or no ____ ___ _________ ___ _______ ________ __________ ____ __________ ___.
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