Randy has a box of Smarties candies. Randy leaves the room, and while he is away, Michelle plays a trick on him. She removes the Smarties and replaces them with rocks. Their son, Zeven, notices this, and starts laughing knowing that his Dad, Randy, will be tricked! Zeven has mastered:

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.