The reason why the differences in the growth stories of North Korea and South Korea can be viewed approximately as a natural experiment or an experiment of history is that:
A) institutions in both countries was changing radically, while geography and culture remained largely unchanged.
B) culture in both countries was changing radically, while geography and institutions remained largely unchanged.
C) geography in both countries was changing radically, while culture and institutions remained largely unchanged.
D) institutions, geography, and culture in both countries were changing radically.
Question 2
The biggest wave of bank failures in the U.S. occurred:
A) during the Great Depression. B) before the Great Depression.
C) during 2007 to 2009. D) in the early 1990s.
Pacific Silver Fir cone debris from feeding Douglas Squirrels, North Cascades National Park
The Russians planted a flag on the sea floor beneath the North Pole
Growth of World Trade, 1870–2010
Logistic and environmental growth
North American temperate deciduous forest. Forest soil profile at right.