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

Multiple Choice

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:

A) observation.
B) variable.
C) control.
D) statistic.
E) hypothesis.