Is Indus Valley civilization, China civilization and west Asian civilization all in the timeline between 8000BC-1500s?

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

Which factor was a major cause of the great depression of the 1930?

Characteristics of what type of economic system are being described below? 1.economy in which some/all of the basic economic questions answered by central authority 2.trade generally limited to what is produced through the influence of the government a.command economies. b.market economies. c.traditional economies.