Astudent sets up an experiment with two groups of bacteria. one group is expoded to the normal amount of mercury found in the environment. the other group gets a larger dose. which term describes the normally treated group?

The normally treated group is called the control. Scientists use control to lessen the effects of variables. The accuracy of the results becomes higher. Control groups can be positive or negative depending on the expectation of a phenomenon that would occur in it.

Ithink the answer is d.