Mongolic tribes, such as the lan, huyan, and qinlin, were the core of the empire.

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so what is your question?

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.

the answer is c. hope this