How do people react when they are able to freely communicate with one another?

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.

Which case is the excerpt most likely from

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?