Joseph is invetigating the relationship between energy and motion of an object. Joseph releases a ball onto a u shaped ramp and observes the rmotion of the ball as it rolls back and forth between sides 1 and 2. What is the energy in this system?

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.