Which river valley civilization was the largest

they protect them in many ways.

most build a museums

give the museums money to support and finace and advertise there relgion.

cultivate talents such as cultural relics management and cultural relic protection and restoration.

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

c) they were beaten and fired from their jobs.

hello,

the steamboat is your answer.

it seems like its the only form of transportation on the choices.