An archaeologist studies a) the origins of wordsb) the lives of early humans by examining artifactsc) the earth, rock forms, and strata. d) early human culture and development compared to the present day

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.