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(B) The swan-necked flask experiment was performed by $Louis \ Pasteur$. This experiment was crucial in disproving the theory of $Spontaneous \ Genera

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Louis Pasteur

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(B) The swan-necked flask experiment was performed by $Louis \ Pasteur$. This experiment was crucial in disproving the theory of $Spontaneous \ Generation$ (abiogenesis). $Pasteur$ demonstrated that microorganisms do not arise spontaneously from non-living matter but originate from pre-existing microorganisms present in the air. By using a flask with a long,curved neck,he allowed air to enter but trapped dust and microbes in the bend,showing that the broth remained sterile unless exposed to these contaminants.

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