A dutie is something that must be done, A responsibility is something that should be done but is not required.
For example, Our duties as citizens is to pay our taxes. But our responsibilities as citizens is to vote.
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B.
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The main purpose of the United Nations was to protect the members against aggression. The difference in the way that U.s and Soviet were affected after the war and political and economic differences, their postwar goals were very different. But the government poured money into science education.
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