He created great controversy among scientists, and to settle the dispute, cell theory was adjusted to include both spontaneous generation and the idea that cells come from pre-existing cells.
He showed that the broth was composed of micro-organisms which needed air, showing that cells need oxygen for cellular respiration.
His work, which was documented and repeatable, contradicted the accepted cell theory, so a change in the theory was required.
His reputation as a great scientist convinced other scientists to accept his work and change cell theory.
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