Please help right now “After Lenin's death What was Stalin's first moves”

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.

According to the aztec history, how did the aztecs know where to build their new city of tenochtitlan? why was this a good location?

On a production possibility curve, data points that fall outside of the curve represent what