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We argue that the reverse of a common observation\u2014that life requires a source of free energy to persist\u2014provides an appropriate principle to understand the emergence, organization, and persistence of life on earth. Life, and in particular core biochemistry, has many properties of a relaxation channel that was driven into existence by free energy stresses from the earth's geochemistry. Like lightning or convective storms, the carbon, nitrogen, and phosphorus fluxes through core anabolic pathways make sense as the order parameters in a phase transition from an abiotic to a living state of the geosphere. Interpreting core pathways as order parameters would both explain their stability over billions of years, and perhaps predict the uniqueness of specific optimal chemical pathways. \u00a9 2007 Wiley Periodicals, Inc. Complexity, 2007<\/jats:p>","DOI":"10.1002\/cplx.20191","type":"journal-article","created":{"date-parts":[[2007,10,8]],"date-time":"2007-10-08T18:53:12Z","timestamp":1191869592000},"page":"51-59","source":"Crossref","is-referenced-by-count":103,"title":["Energy flow and the organization of life"],"prefix":"10.1002","volume":"13","author":[{"given":"Harold","family":"Morowitz","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eric","family":"Smith","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2007,10,8]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF00927010"},{"key":"e_1_2_1_3_2","volume-title":"Biology of the Prokaryotes","author":"Lengeler J. 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