One of the reasons for the success of early civilizations such as those in egypt and mesopotamia was because a) they formed democratically elected governments. eliminate b) they were able to find ways to make stone tools. c) they were geographically protected from outside invaders. d) they used rivers and bodies of water for food and for trade.

The correct option is D: they used rivers and bodies of water for food and for trade.

Explanation: A clear example is the Nile River, the main tributary that bordered these two important civilizations since the fertile lands near the Nile, allowed them to plant wheat, barley, some fruit and vegetable species, which were products of great agricultural importance The Nile River was also important because it is the main route for the transport of people and goods and for the settlement of various Egyptian and Mesopotamian peoples.

d.prevent the spread of communism outside of eastern europe.

b.

jim crow laws were enacted in northern states.