Lazzaro spallanzani and louis pateur both performed experiments hoping to disprove the hypothesis that organisms can form by spontaneous generation. which of the following flask was included in pasteur's experiment that was not included in ssspallanzani's?

a. a flask that allowed air to enter but did not allow microorganisms to enter
b. a flask that did not allowair to enter but did allow microoganisms to enter
c. a flask that allowed neither air to enter nor microorganisms to enter
d. a flask that allowed both air th enter and microorganisms