Fast! will mark brainliest when did urbanization in china began to surge? a. the late 1960s b. the late 1970s c. the 1990s d. the turn of the 2000 century

Which environmental change allowed people to travel by land between asia and north america a. human apaption to arctic environments b. the introduction to horses to north america c. the formation of ice sheets on land d. a rise in ocean temperatures