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Unformatted text preview: later with samples from comets thought to preserve material unchanged for the last 4.5 billion years. The samples showed that the amino acid glycine was present in the samples. Scientists and academics now believe that these discoveries show that the chemical reactions that produce glycine have been occurring for billions of years, throughout the early solar system. This was not always believed because some thought that these types of chemical reactions could only occur in warm and wet conditions, like those of an asteroid, but not those of a comet....
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- Spring '10