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Which factor has played the most important role in changing the way history is studied over time?

Which is likely the most serious problem associated with an epidemic? 1. there are sometimes no cures to the diseases that spread. 2. people often die from the diseases that spread. 3. there are usually no ways to prevent people from getting ill. 4. people often don’t know they have a disease.

Which statement is true of both presidential and parliamentary systems of government?