During the middle school years, a child's self-concept:

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.

The following force measurements were taken during actual testing of the lever pictured. what is the ama of this lever?

Adolescents can display egocentrism when they become about changes in their lives.