What was one effect of the 6,000–5,000 bc climate change in northern africa? a. people who lived in the northern african grasslands stopped making pottery. b. people changed from farming to hunting and gathering. c. people who lived in the northern african grasslands migrated to the nile.

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.

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Which chinese invention is used to measur the strength of earthquakeswhich chinese invention is used to measure the strength of earthquakes