To analyze the effects of a new drug for anxiety developed by Solvit Wellness Inc., researchers conduct a study on two groups. Both the groups are informed about the usefulness of the drug in treating anxiety. However, only group A receives an injection of the actual drug, while group B receives an injection containing an inert substance. In this scenario, group B is known as a(n) .

Control group

Explanation:

In an experiment, the group which receives the treatment (in this case injection of actual drug)  is known as experimental group because the experiment is being conducted on it. While on the other hand the group which do not receive the treatment is known as control group. The results obtained from the experimental group are compared with the control group to determine the effectiveness of the treatment.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.