Which two of the following best identify the central ideas of Nixon's speech?

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.

How much time on average do americans currently spend watching tv and videos per day?

What did economist john maynard keynes believe about deficit spending?