Chemical evolution

The formation of complex organic molecules from simpler inorganic molecules through chemical reactions in the oceans during the early history of the Earth; the first step in the development of life on this planet. The period of chemical evolution lasted less than a billion years.

Chemical evolution may refer to:

• Nucleosynthesis, the creation of chemical elements in the universe either through the Big Bang, or supernovae
• Abiogenesis, the transition from nonliving elements to living systems
• Molecular evolution, evolution at the scale of molecules

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