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In 1936, Aleksandr Ivanovich Oparin, in his "The Origin of Life on Earth", demonstrated that organic molecules could be created in an oxygen-less atmosphere, through the action of sunlight. These molecules, he suggested, combine in ever-more complex fashion until they are dissolved into a coacervate droplet. These droplets could then fuse with other droplets and break apart into two replicas of the original. This could be viewed as a primitive form of reproduction and metabolism. Favorable attributes such as increased durability in the structure would survive more often than nonfavorable attributes.
Around the same time J. B. S. Haldane suggested that the earth's pre-biotic oceans - very different from their modern counterparts - would have formed a "hot dilute soup" in which organic compounds, the building blocks of life, could have formed. This idea was called biopoiesis or biopoesis, the process of living matter evolving from self-replicating but nonliving molecules.
In 1953, taking their cue from Oparin and Haldane, the chemists Stanley L. Miller and Harold C. Urey carried out an experiment on the "primeval soup". Within two weeks a racemic mixture of a few amino acids, some of the building blocks of life, had formed from the highly reduced mixture of methane, ammonia, water vapor and hydrogen. While Miller and Urey did not actually create life, they demonstrated that a more complex molecule — a few amino-acids — could emerge spontaneously from simpler chemicals. The environment was meant to simulate a primeval earth. It included an external energy source and an atmosphere largely devoid of oxygen. (the specific experiment involved shooting a spark, representing lightning, into their flask) There was careful filtering in place to preserve the results from destruction.
Their experiments had different results from Pasteur's because they involved different conditions. Since that time there have been other experiments that continue to look into possible ways for life to have formed from non-living chemicals, that is the experiments conducted by Joan Oró in 1961.
2006-12-11 20:00:26
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answer #1
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answered by Paw 3
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Any person in the world who was unable to prove existence of anything non-material in the body of a human being or for that matter in the body of any other creature. Except the elements found in the abiotic component, nothing else has ever been proved to constitute any part of a human being.
2006-12-12 06:11:39
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answer #2
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answered by pradeep kumar g 1
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Depends on how far back you want to go. There is abundant evidence that when matter first formed in the universe it was almost entirely hydrogen and helium.
Carbon was manufactured in stars and released when they exploded. Then "organic" chemical compounds, then life. That sequence is well established.
I'm not saying anything about whether a higher power made it all happen. According to all scientific evidence, that's possible.
Actually it's pretty awesome. We are the stuff of exploding stars, gathered together in this place in an amazing way.
2006-12-12 11:46:39
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answer #3
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answered by Bob 7
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