The more formal experiments on the relationship between germ and disease were conducted by Louis Pasteur between 1860 and 1864. He discovered the pathology of the puerperal fever and the pyogenic vibrio in the blood, and suggested using boric acid to kill these microorganisms before and after confinement.
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Outside factors are not always constant meaning that there is little way to control them.
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tsunamis I believe if not I apologize
It affects how it flows threw your arteries
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2.They are specialized to do certain tasks