Which of the following was a crucial difference between the work of John T. Needham and Louis Pasteur on the question of spontaneous generation?
A. Whether or not the infusions were boiled.
B. Whether or not the flasks were sealed.
C. Whether meat or infusions were used.
D. The length of time the flasks were boiled.
E. The method of sealing the flasks.
Answer: B
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____________________ Indicate whether the statement is true or false.