Researchers conduct an experiment in which one group is exposed to treatment a and the other group is exposed to treatment b. the treatments are

Experimental (Treatment A) and control (Treatment B)

Explanation:

When conducting experiments, two groups of test subjects such as people, plants, animals, etc are put in place and these groups must be identical in every but one aspect. The treatment is usually being given to the experimental group or treatment group, which could be inform of new medication, counselling, etc. while the control group would not receive any of such treatments in the process.

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