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(詳細はSoviet biologist Alexander Oparin. In 1924, he proposed a theory of the origin of life on Earth through the transformation, during the gradual chemical evolution of molecules that contain carbon in the primordial soup. Biochemist Robert Shapiro has summarized the "primordial soup" theory of Oparin and Haldane in its "mature form" as follows: # Early Earth had a chemically reducing atmosphere. # This atmosphere, exposed to energy in various forms, produced simple organic compounds ("monomers"). # These compounds accumulated in a "soup", which may have been concentrated at various locations (shorelines, oceanic vents etc.). # By further transformation, more complex organic polymers – and ultimately life – developed in the soup. ==A reducing atmosphere== Whether the mixture of gases used in the Miller–Urey experiment truly reflects the atmospheric content of early Earth is controversial. Other less reducing gases produce a lower yield and variety. It was once thought that appreciable amounts of molecular oxygen were present in the prebiotic atmosphere , which would have essentially prevented the formation of organic molecules; however, the current scientific consensus is that such was not the case. (See Oxygen catastrophe). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「primordial soup」の詳細全文を読む スポンサード リンク
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