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==La atmósfera primitiva==
[[File:Miller-Urey.png|thumb|200px|Figura diseño del experimento de [[Stanley Miller|Miller]]-Urey, que muestra la atmósfera primitiva asumida por ellos]]
Las teorías sobre el origen de la vida inicialmente asumieron que la atmósfera primitiva debería ser una reductora con el fin de prevenir la destrucción oxidativa de los componentes de la "sopa primordial".<ref>{{cita libro|autor=Aw, S. E|título=Chemical Evolution|editorial=Master Books|ubicación=San Diego, California|año=1982|isbn=0-89051-082-2}}</ref> So the evolutionists theorize an early atmosphere without oxygenAsí que los evolucionistas teorizan una atmósfera primitiva sin oxígeno. [[Oparin]] believed that the Earth's early atmosphere was composed of hydrogen creía que atmósfera primitiva de la Tierra estaba compuesta por hidrógeno (H<sub>2</sub>), methane metano (CH<sub>4</sub>), ammonia azano (NH<sub>3</sub>) and y el vapor de [[wateragua]] vapor (H<sub>2</sub>O), containing que no oxygencontenía oxígeno.<ref name=how /> [[J. B. S. Haldane|Haldane]] postulated the same theory and his most important conclusions were presented in a short article for the postuló la misma teoría, y sus conclusiones más importantes se presentaron en un pequeño artículo para el ''Rationalist Annual''.<ref name=clark>{{cite bookcita libro|authorautor=Clark, Ronald W|titletítulo=J B S: The Life and Work of J. B. S. Haldane|publishereditorial=Coward-McCann, Inc.|locationubicación=New York|yearaño=1969|pagepágina=93-94|id=Library of Congress Catalog Card Number:68-11875}}</ref> Other scientists who corroborated this model of atmosphere were Otros científicos que corroboraban este modelo de la atmósfera eran Miller and y Urey. They reasoned that a small but significant amount of Ellos razonaron que una pequeña pero significativa cantidad de H<sub>2</sub> remained in the permaneció en la atmósfera primordial atmosphere and reacted with atoms of carbony se hizo reaccionar con átomos de carbono, nitrogen or oxigen forming this kind of atmospherede nitrógeno o de oxígeno formando este tipo de atmósfera.<ref>{{cite bookcita libro|authorautor=[[Charles Thaxton|Thaxton, Charles B.]]; Bradley, Walter L.; Olsen, Roger L|titletítulo=The Mistery of Life's Origin: Reassessing Current Theories|publishereditorial=Philosophical Library|locationubicación=New York|yearaño=1984|pagepágina=74|isbn=0-8022-2447-4}}</ref> By sparking together hydrogen, methane, ammonia, and water vapor, they produced several amino acids, the building blocks of organic life.<ref>{{cite book|author=Smith, A. E. Wilder|authorlink=A. E. Wilder-Smith|title=The Creation of Life: A Cybernetic Approach to Evolution|publisher=Harold Shaw Publishers|location=Wheaton, Illinois|year=1970|page=49|isbn=0-87788-144-8}}</ref>
Nowadays there is almost universal agreement among specialists that the primitive atmosphere contained no reducing gases like methane, ammonia or hydrogen.<ref name=bydesign>{{cite book|author=Sarfati, Jonathan|authorlink=Jonathan Sarfati|title=[[By Design]]:Evidence for Nature's Intelligent Designer - the God of the Bible|publisher=Creation Book Publishers|location=Powder Springs, GA|year=2008|isbn=978-0-94990672-4}}</ref> Instead, it is that the atmosphere contained [[carbon dioxide]] and nitrogen.<ref name=bydesign /> According [[Hubert Yockey]], the modern view regarding the atmosphere of the early Earth is that it was neutral and composed of nitrogen (N<sub>2</sub>), carbon dioxide (CO<sub>2</sub>), water (H<sub>2</sub>O) and maybe some ammonia (NH<sub>3</sub>).<ref>{{cite book|author=Yockey, Hubert P|authorlink=Hubert Yockey|title=Information Theory, Evolution, and the Origin of Life|publisher=Cambridge University Press|location=Cambridge|year=2005|page=146|isbn=978-0-521-80293-2}}</ref>
