Answer:
It's an observational study.
Explanation:
Because the study was focused on the reactions of the toddlers with the robot, the mainly thing on it was the behavior of them and reaction after the adult left the room; they used variants for them to compared and therefore has a more clear result.
<span>The United States would use economic and military measures to prevent the spread of Communism.</span>
<span>Dinh Tien Hoang instituted universal military mobilization.</span>
Native Americans fought on both sides of the Civil War (Union and Confederate) fearing being on the losing side would damage and lose their way of life.
(A) The war caused Native American tribes to sign treaties and side with Union forces who promised to help develop Indian territory
(E) The War led Native American tribes to sign treaties with the Confederacy, which promised to protect the tribes and their interests in exchange for support in the war.
