Answer:
In some experiments, several identical groups are set up, keeping conditions similar among them. In the experimental group, a change is deliberately introduced. In the control group, this change is not introduced. In this way, the researcher can determine if the change has an effect.
Step-by-step explanation:
In every experiment that has to do with having a replicate, there must be a control group which is used to checkmate the effect of what is being tested, hence; nothing is introduced in the control group unlike the experimental group