Which of the following bring an end to cattle drives? (1 point)
a. farmers in the east started to raise more cattle.
b. the cattle wouldn’t eat the wheat grown on the great plains.
c. cattle rustlers stole entire herds.
d. the railroad expanded to texas

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.