Which common factor allowed both the macedonian empire under alexander the great and the roman empire to expand?
-a. they both recruited foreign soldiers to lead their armies.
-b. they both allowed wealthy merchants to create monopolies.
-c. they both created strong centralized forms of government.
-d. they both used religion to strengthen their governments.

22. the effect of threshold braking is to a. cause skids. b. lock wheels. c. prevent locking of wheels. d. increase stopping distance.

Which term describes a possible explanation of, or answer to, a scientific question that is based on prior knowledge or research and that is testable?

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.