Socialogical viewpoint that focuses on the forces in society that promote competition and change

Lava and other matierls luanced from a volcano and into the air are referenced as

How does specialization enable countries to trade with one another? a country can make and sell goods affordably and buy goods that it is inefficient at making. a country can make what it chooses and sell its goods to other countries. a country can decide to buy everything it needs from other countries. a country can efficiently make goods that were once difficult to make.

What refers to the existence of more than one level of government in the country