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(B) Louis Pasteur demonstrated that life comes only from pre-existing life (biogenesis). He used swan-necked flasks (or $S$-shaped neck flasks) in his

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He used swan-necked flasks.

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(B) Louis Pasteur demonstrated that life comes only from pre-existing life (biogenesis). He used swan-necked flasks (or $S$-shaped neck flasks) in his experiment. In these flasks,the air could enter,but dust particles and microorganisms were trapped in the curved neck. As a result,the broth in the flask remained sterile,proving that spontaneous generation does not occur.

Louis Pasteur successfully rejected the theory of spontaneous generation because:

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