Dr. garcia is known for his difficult pop quizzes. typically, he closes the classroom door just before he's about to give a quiz, which makes his students anxious and tense. students soon learn to feel anxious whenever dr. garcia closes the classroom door. closing the door has become a(n):

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the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.