Which economic activities are most common ways of producing goods and services in countries across africa?
a. subsistence farming and commercial farming
b. livestock raising and commercial farming
c. nomadic herding and hunting and gathering
d. subsistence farming and nomadic hearding

Impressions of tropical swamp plants were observed on rocks in polar regions. the impressions were dark black imprints, which means the fossils are examples of ( 1 ) the fossils tell us that polar regions ( 2 ) ( 1 ) a. carbonization b. mineralization c. trace fossils ( 2 ) a. had tropical plants that can grow in ice b. might have had a diffierent climate in the past c. will have abundent vegitation

Because its government strictly controls its economy, north korea has a economy. a. command b. mixed c. traditional d. free market

What id the primary human cause of the global warming a. storage of nuclear fuel rods b. burning of fossil fuels c. building of high-density housing d. violent conflicts over natural resources