Why was traveling challenging in ancient greece?

Which of the following is a personal responsibilty

Essay: both benedict arnold and alexander hamilton were ambitious men who took great risks as leaders in the american revolution. write an essay in which you discuss the impact that the ambitions of individuals had on the birth of the united states. remember to use textual evidence from both written sources to support your argument.

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.