Indicador que tiene directa relación con la esperanza de vida al nacer.

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

they remained in rural areas and worked at jobs such as lumbering or farming.

what the first or next guy says

b) they want the land taken away from the wealthy landowners and given to peasants.