This refers to the earliest stage in the evolutionary history of life, when organic components of matter accumulate in the environment from simple inorganic molecules. However, this is a somewhat restrictive term, and in a broader sense, it can include all chemical aspects of biological evolution, such as the evolutionary changes in cellular components, but it is less confusing to distinguish these later stages as biochemical evolution. Chemical evolution requires an energy source to increase the complexity of molecules, and in the case of chemical evolution on the early Earth, sources of energy that are thought to have come from ultraviolet light in sunlight, thermal energy from the Earth's crust, atmospheric discharges, and shock waves from meteorites. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
生命の全進化史のうちで,その最も初期の,単純な無機分子から有機物質の素材成分が環境に蓄積してくる段階をさす。ただしこれはやや限定的な用法であり,広義には,生物進化の化学的側面すべて,たとえば細胞成分物質の進化につれての変化なども含めることもあるが,これら後期の段階は,生化学 (的) 進化として区別するほうがまぎらわしくない。化学進化のためには,分子の複雑化のためのエネルギー源が必要であり,原初地球上での化学進化においては,日光中の紫外線,地殻の熱エネルギー,空中放電,隕石などの衝撃波などが考えられている。
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