Prevention is better than cure. Justify in long answer. "Perfect answer will be marked as brainlist"

Dr. redbull conducts a study to determine whether her new energy drink children perform better on spelling tests. she randomly assigns children to one of two groups: group 1 receives her energy drink and group 2 receives water. she then gives both groups a spelling test and compares the results. which of the following is true about this study? a. group 1 is the dependent variable and group 2 is the independent variable. b. this is a correlational study. c. group 2 is the experimental group. d. the independent variable is the type of drink the children receive.

In 1866, a mob in which tennessee city attacked local african americans and burned down homes and schools?

How many states were there when the constitution was written?