Giving a thumbs up in America is a positive sign but it is offensive/negative in some Eastern cultures. This is an example of? A. Cultural perception
B. Cultural diversity
C. Cultural sign language
D. Cultural differences.

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.