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Chemical evolution may refer to:

• Stellar nucleosynthesis, the creation of chemical elements by stellar thermonuclear fusion or supernovae
• Abiogenesis, the transition from nonliving elements to living systems
• Molecular evolution, evolution at the scale of molecules
• Gas evolution reaction, the process of a gas bubbling out from a solution
• Oxygen evolution, the process of generating molecular oxygen through chemical reaction
• Cosmochemistry (or astrochemistry),study of the chemical composition of matter in the universe, including complex organics, and the processes that led to those compositions.

• Disambiguation pages