The fact that we cannot have everything we want is caused by

scarcity
benefits
trade-offs
demand

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.

Are people more motivated to change from positive or negative experiences, like slavery, womens rights, and any other historical movements/moments? i need more factual information than opinions.

The patriot act made it easier for law enforcement agencies to conduct surveillance under certain circumstances true or false