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Pasteur and Spontaneous Generation
Pasteur's test of spontaneous generation.
By sterilizing a food source and keeping it isolated from the outside, Pasteur observed no putrefaction of the food source (top panel). Upon exposure to the outside environment, Pasteur observed the putrefaction of the food source (bottom panel). This strongly suggested that the components needed to create life do not spontaneously arise.
Source
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"Experiment Pasteur English."
http://commons.wikimedia.org/wiki/File:Experiment_Pasteur_English.jpg
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