When Pasteur tested the hypothesis of spontaneous generation,he compared the ability of a sterilized growth medium (meat broth)to produce a population of bacteria in two different types of flasks.One had a simple neck open to the outside,and the other had a "goose neck" bend that also was open to the environment.Pasteur expected that bacteria would appear in the flask with the standard neck.In this experiment,the standard neck flask served as a/an:

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The flask with the standard neck served as the control in the experiment because it was the flask where Pasteur did not expect to see bacteria growth, and it served as the basis for comparison with the experimental flask with the goose neck bend.

When Pasteur Tested the Hypothesis of Spontaneous Generation,he Compared the Ability