Question

the passage below describes an experiment. aaron is a florist. he wants to make sure his bouquets are staying fresh for as long as possible. aaron read that sugar will feed the bouquets and keep them fresh. he prepared six vases with water and added a fresh bouquet of roses to each. in two of the vases he mixed one - half cup of soda with the water. in two others he mixed one - fourth cup of soda with the water. aaron observed how much the bouquets in each vase wilted over one week. in this experiment, the vases with only water were part of a control group an experimental group

Explanation:

In an experiment, the control group is the group that does not receive the treatment (in this case, the addition of soda). It serves as a baseline to compare the effects of the treatment on the experimental groups. The vases with only water did not have any soda added, so they are the control group.

Answer:

a control group