Well, the use for the atomic bomb was that it was dropped on Hiroshima and Nagasaki to end the war (With Japan at least) The rest are technically true, but that wasn't really it's use. So A is you best bet here:)
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Above a certain level, brain drain reduces the stock of human capital and induces occupational distortions. Source: [1]. The term “brain drain” refers to the international transfer of human capital resources, and it applies mainly to the migration of highly educated individuals from developing to developed countries
Jefferson and Hamilton disagreed on whether the United States should have a strong, central government or not.
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During the election of 1828, two political parties were elected. The National Republicans were in favor of John Adams, and therefore favored a stronger central government. The opposing campaign was for Andrew Jackson.
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Answer:A key difference between presidential and parliamentary systems lies in removing a chief executive or dissolving the legislature. In parliamentary systems, the chief executive's term of office is directly linked thereto of the legislature, while in presidential systems the terms aren't linked
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