Question

two groups of rats are divided into two groups. one group is fed a normal diet, whereas the other group is fed the same diet with one necessary mineral left out. the animals receiving the normal diet remained healthy; those in the other group grew weaker. what is considered the control group in this experiment? the group fed the diet without one mineral the mineral the group fed the normal diet

Explanation:

In an experiment, the control group is the one that follows the normal or standard condition to compare with the experimental group (which has a variable changed). Here, the group fed the normal diet (with all necessary minerals) serves as the control to compare with the group missing one mineral. The option "the group fed the normal diet" matches this definition of a control group. The "the group fed the diet without one mineral" is the experimental group, and "the mineral" is not a group.

Answer:

the group fed the normal diet