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( Spontaneous generation)
Spontaneous generation is an obsolete theory regarding the origin of life from inanimate matter, which held that this process was a commonplace and everyday occurrence. The original theory is attributed to Aristotle, and it held sway for two millennia. It is generally accepted to have been ultimately disproven in the 19th Century by the experiments of Louis Pasteur, expanding upon the experiments of other scientists before him. Ultimately, it was succeeded by germ theory and cell theory. The disproof of ongoing spontaneous generation is no longer controversial, now that the life cycles of maggots and other pests have been well documented. However, the question of abiogenesis, how living things originally arose from non-living material, remains relevant today. Aristotle lay the foundations of Western natural philosophy. In his book, The History of Animals, he stated in no uncertain terms Now there is one property that animals are found to have in common with plants. For some plants are generated from the seed of plants, whilst other plants are self-generated through the formation of some elemental principle similar to a seed; and of these latter plants some derive their nutriment from the ground, whilst others grow inside other plants, as is mentioned, by the way, in my treatise on Botany. So with animals, some spring from parent animals according to their kind, whilst others grow spontaneously and not from kindred stock; and of these instances of spontaneous generation some come from putrefying earth or vegetable matter, as is the case with a number of insects, while others are spontaneously generated in the inside of animals out of the secretions of their several organs.[1]
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