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 />
Red-Bull, Sleep, and food!!
The first one is correct. In a planned economy, also known as a command economy, the state determines prices and allocates resources.
The answer is B
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