Which factors allowed for the development of the four river-valley civilizations of mesopotamia, egypt, the indus valley and china? a the division of labor b a government run by a king c a surplus of food d a location next to rivers e a complex system of writing

The correct answers are:

- The location next to rivers

- A surplus of food

- The Division of Labor

The location next to rivers - Yellow River, Indus River, Euphrates River, Tigris River, and Nile River - helped those civilizations to do an agricultural revolution and become settled communities.

They created new technology to help with agriculture, such as calendars, the wheel, alphabets, bureaucracies, division of time into units of 60, mathematical concepts and other agricultural objects. So they could have a better production they divided labor mainly into social classes.

This at the end, created a surplus of food and they could have a better quality of life and endure longer than other civilizations.

where is the picture?