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The executive departments were created by the United States Congress to manage specific areas of national and international affairs, and several departments are responsible for the administration of federal laws. The heads of the fifteen departments are elected by the President and approved with the advice of the Senate.
Diseases introduced by the Columbian Exchange caused a sharp decline in population levels in the Americas beginning in the 15th century. The correct option among all the options given in the question is option "C". The natives never faced the diseases that attacked them and so they did not have any cure for them. <span />
<span>It would be "correlating" rocks of similar age in different regions.</span>
