Where did life originate and how

Where did life originate and how - : Since science is an...

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Where did life originate and how? Extra-terrestrial : In 1969, a meteorite (left-over bits from the origin of the solar system) landed near Allende, Mexico. The Allende Meteorite (and others of its sort) have been analyzed and found to contain amino acids , the building blocks of proteins , one of the four organic molecule groups basic to all life. The idea of panspermia hypothesized that life originated out in space and came to earth inside a meteorite. Recently, this idea has been revived as Cosmic Ancestry. The amino acids recovered from meteorites are in a group known as exotics: they do not occur in the chemical systems of living things. The ET theory is now not considered by most scientists to be correct, although the August 1996 discovery of the Martian meteorite and its possible fossils have revived thought of life elsewhere in the Solar System. Supernatural
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Unformatted text preview: : Since science is an attempt to measure and study the natural world, this theory is outside science (at least our current understanding of science). Science classes deal with science, and this idea is in the category of not-science. Organic Chemical Evolution : Until the mid-1800's scientists thought organic chemicals (those with a C-C skeleton) could only form by the actions of living things. A French scientist heated crystals of a mineral (a mineral is by definition inorganic), and discovered that they formed urea (an organic chemical) when they cooled. Russian scientist and academecian A.I. Oparin , in 1922, hypothesized that cellular life was preceeded by a period of chemical evolution. These chemicals, he argued, must have arisen spontaneously under conditions exisitng billions of years ago (and quite unlike current conditions)....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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