In a society where groups interact closely on a basis of equality, what are the tendencies that usually occurs?
a.. high levels of prejudice..
b.. vast differences in power held by the various groups..
c.. low levels of prejudice..
d.. high levels of discrimination.

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.