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In evolutionary biology , abiogenesis , or informally the origin of life OoL , [3] [4] [5] [a] is the natural process by which life has arisen from non-living matter, such as simple organic compounds. There are several principles and hypotheses for how abiogenesis could have occurred. The study of abiogenesis aims to determine how pre-life chemical reactions gave rise to life under conditions strikingly different from those on Earth today. Life functions through the specialized chemistry of carbon and water and builds largely upon four key families of chemicals: lipids cell membranes , carbohydrates sugars, cellulose , amino acids protein metabolism , and nucleic acids DNA and RNA. Any successful theory of abiogenesis must explain the origins and interactions of these classes of molecules. Researchers generally think that current life descends from an RNA world , [17] although other self-replicating molecules may have preceded RNA. The classic Miller—Urey experiment and similar research demonstrated that most amino acids, the chemical constituents of the proteins used in all living organisms, can be synthesized from inorganic compounds under conditions intended to replicate those of the early Earth. Scientists have proposed various external sources of energy that may have triggered these reactions, including lightning and radiation. Other approaches "metabolism-first" hypotheses focus on understanding how catalysis in chemical systems on the early Earth might have provided the precursor molecules necessary for self-replication. The alternative panspermia hypothesis [21] speculates that microscopic life arose outside Earth by unknown mechanisms, and spread to the early Earth on space dust [22] and meteoroids. cellular respiration story.
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