a medical reasearcher is testing a new experimental drug for a headache patients Group A consists of 100 participants who are given the new exprimental drug group B consists of 100 participants who are given a placebo or fake pill. Neither group knows which treatment they received Which is the control group?

Group B... (the Placebo)

Explanation:

I say group B because the medical reasearchers are using group B to see the outcome and effects of the experimtal drug that they gave group A. So if in the end group A (given the experimental drug) has a better response to the headache after taking the pill then group B (given a fake drug) the medical reasearcher will know the effectiveness of the new drug.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

your spelling is a little off : ]