What thing did most river valley civilizations have in common?

1. where does the energy of a nuclear power plant come from?

d) political bosses should not hold office

1(a) traditional methods of production are upheld.

2(d) to convert private property to state-owned property

3b) feudalism

5(a) question

6(c) to preserve the past

7(d) the opportunity to make a profit

8(b) get paid by the government

could not do 4 sorry. . hope this