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How did Louis Pasteur successfully demol...

How did Louis Pasteur successfully demolish the popular theory of spontaneous generation?

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It was believed that living organisms (life) arose from decaying matter like straw. But Louis Pasteur demonstrated that life can arise only from preexisting life. He said that no life arose from the heat-killed yeast broth that was kept in a pre-sterilised flask kept closed, while new living organisms arose from the heat killed yeast that was kept jn the flask left open.
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