Methane
The simplest saturated hydrocarbon. It is a colorless, flammable gas, slightly soluble in water. It is one of the chief constituents of natural gas and is formed in the decomposition of organic matter. (Grant and Hackh's Chemical Dictionary, 5th ed)
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Tree Number(s): D02.455.326.146.571
MeSH Unique ID: D008697
Registry Number: OP0UW79H66