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The medical science field relies on animal research for the development of New Hip Hop - ks.jiali.tw, treatments and medical technologies. In the early nineteenth century, Louis Pasteur infected sheep with anthrax, thus proving the germ theory of medicine ' an important advancement which proved once and for all that infections did not arise spontaneously. The first observations of significance to modern science were made in the 1600s, when William Harvey used animals to observe and describe the blood circulatory system.