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founder of spontaneous generation theory
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suggested that life came from invisible eggs by dissecting pregnant deer
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meat in jars...
maggots came from flies that could be excluded -
can contaminate melon with fungal spores to grow the same fungus.
spoilage comes from spreading spores -
boiled broth, then sealed the jar, broth still spoiled
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There is an early part of a plant or animal 'germ' that has everything needed to grow into the adult plant or animal with time and nutrition
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Swan neck flask
Boiled broth in open flask with access to air, but no dust. Broth did not spoil.