How did pasteur experiment vary from spallanzani, Biology

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How did Pasteur's experiment vary from Spallanzani's experiment?

Instead of sealing the flask in the experimental group after boiling, Pasteur used a flask with a curved neck, which permitted air inside and outside the flask to mix but stopped microorganisms from entering the body of the flask.

 


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How did Pasteur's experiment vary from Spallanzani's experiment? Instead of sealing the flask in the experimental group after boiling, Pasteur used a flask with a curved neck,

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