As a control, Pasteur cut off the tops of swan-necked flasks and allowed microorganisms from the air
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As a control, Pasteur cut off the tops of swan-necked flasks and allowed microorganisms from the air to fall into the flask. His experimental swan-necked flasks were
a. not broken.
b. covered with gauze.
c. deliberately seeded with microbes.
d. also heat-sealed.
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