Answer:
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In Redi's experiment, the control group consisted of jars that were left open or uncovered. The purpose of the control group was to provide a baseline against which the experimental groups could be compared.
In Redi's experiment, he aimed to test the theory of spontaneous generation by observing the appearance of maggots on decaying meat. He set up three groups of jars: one group covered with a fine net or cloth, one group covered with a piece of cork, and one group left open or uncovered.
The purpose of the covered groups was to prevent flies from accessing the decaying meat and laying eggs, thus testing the hypothesis that flies were responsible for the appearance of maggots. These covered groups served as the experimental groups.
On the other hand, the control group, consisting of jars left open or uncovered, was not manipulated or changed in any way. This allowed Redi to observe and compare the natural occurrence of maggots in the absence of any intervention or experimental treatment.
Therefore, the control group in Redi's experiment was the group of jars that were left open or uncovered.
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