Answer:Longitudinal study
Explanation:
Longitudinal research is a type study which focuses on studying variables over a period of time which ranges from weeks to years.
How Longitudinal Research Works
Researchers will choose longitudinal study in order to observe the realtionship between variables over time which can't be established through their backgrounds. It focuses on the same variables over that extended period of time , in this case they can see if there are changes that occur over time
Answer:
Wake Up America!
Explanation:
At the dawn of WWI, posters like this asked America to abandon its isolationist policies.
Answer:
<em><u>Weathering & Erosion </u></em>
Explanation:
Weathering & erosion of the Colorado River is the reason the Grand Canyon exists in the first place. (Or Paul Bunyan)