Who lead the house of representatives and house is this different from that of the leader of the senate

The House of Representatives is led by the Speaker of the House while the Senate is led by either the Majority Leader or the Vice President.

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

the answer is migration