Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish. They treat fish in the laboratory with increasing amounts of the chemical for one week and then measure their viability. Fish that are not treated with chemical X are considered ____.

Question

Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish.  They treat fish in the laboratory with increasing amounts of the chemical for one week and then measure their viability. Fish that are not treated with chemical X are considered ____. ​

Quizplus · Accepted Answer

Controls are the group of subjects or conditions that are not exposed to the experimental treatment, in this case, chemical X, and are used as a baseline to compare the effects of the treatment.

Scientists Want to Determine Whether Chemical X, a Component of Fertilizer