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A biogenic substance is a substance produced by life processes. It may be either constituents, or secretions, of plants or animals. A more specific name for these substances is biomolecules. ==Examples== *Coal and oil are possible examples of constituents which may have undergone changes over geologic time periods. *Chalk and limestone are examples of secretions (marine animal shells) which are of geologic age. *grass and wood are biogenic constituents of contemporary origin. *Pearls, silk and ambergris are examples of secretions of contemporary origin. Carbon, from using biogenic and non-biogenic fuels, has implications for estimating the efficiency and environmental benefits of waste-to-energy incineration processes.〔Hogg, Dr. Dominic (2006) (A Changing Climate for Energy from Waste? Final Report for Friends of the Earth )〕 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「biogenic substance」の詳細全文を読む スポンサード リンク
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