Why did Pasteur need to do the control experiment where he broke the neck of the flask and waited to see if microorganisms grew?
a. It is more typical to have a flask without a swan neck.
b. He needed to demonstrate that the broth was able to support microorganisms, even though they did not grow when the neck was intact.
c. He needed to demonstrate that air could flow into and out of the flask when the neck was intact.
d. He needed to demonstrate that he could break the neck of the flask.
