Which factors led to the development of the four river-valley civilizations of Mesopotamia, Egypt, the Indus Valley, and China?
Choose all answers that are correct.
a.the worship of many nature gods
b.the presence of rivers
c.a surplus of food
d.the building of villages and cities
e.the need to unite for protection from enemies
please help
Choose all answers that are correct.
a.the worship of many nature gods
b.the presence of rivers
c.a surplus of food
d.the building of villages and cities
e.the need to unite for protection from enemies