B is the answer because pangea is one super continent
A. Violent attacks form the Eastern tribes even led to the downfall of Rome, as soon as the mongols got to Rome they had no challenge in defeating such a weak nation in it's decline.
Should a president die in office, which official succeeds the president if the vice president is unable to assume the role speaker of the house .
The President is responsible for imposing and enforcing the laws written through Congress and, to that stop, appoints the heads of the federal organizations, consisting of the cabinet. The vice president is likewise part of the govt department, ready to assume the Presidency should the need get up.
The constitution explicitly assigns the president the strength to signal or veto regulation, command the defense force, ask for the written opinion of their cabinet, convene or adjourn Congress, grant reprieves and pardons, and receive ambassadors.
The president directs the overseas policy of the us, making key choices about how America acts in the direction of other countries in the world. The constitution makes the president commander in chief of the nation's defense force.
Learn more about president role here:-brainly.com/question/2136022
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I would have to say D or A but if I had to chose I would say D
