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 />
I say A) Economic Decline
The months of July and August
The flooding was important because it brought fertile soils down the Nile valley which helped boost agriculture.
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