Which dynasty in China begin rebuilding the Great Wall of China

How does wards description of the roman government compare to polybius description in sorce 1 and millars description in source 2

Today england’s government is encouraging tertiary economic activities ,including_to make up for the loss of industry

Two of these describe "federalism." (choose two answers) select one or more: a. the national government absolutely controls all state governments. b. power is shared by the national and state governments. c. state governments exercise absolute power over the national government. d. it is a compromise meant to eliminate the disadvantages of a "unitary" and a "confederate" system.