Derik wanted to know whether people will perform better on a math test if they have caffeine beforehand. so he put everyone in a lab, had them drink their coffee, and then begin their test. he gave half of the unknowing participants decaf, and the other half regular coffee. he then analyzed the results, and found that those who drank decaf scored significantly lower than those who were given normal coffee. in derik's experiment, the control group consists

the control group consists of people who drank decaf coffee

explanation:

a control group consists of the group that is separate from everything else

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.

answer; i do believe that the answer is (c) electrolyte imbalance or (d) cessation of menstrual cycle; plz check first good luck