A) Climate change is insufficient alone to explain the rise of all civilizations.
B) Climate change always played an important role.
C) There is little correlation between climate change and the emergence of civilizations.
D) Climate change can never account for the emergence of civilizations.
E) The presence of severe drought conditions can be linked to the emergence of civilizations.

A) the restricted access to the means of communication
B) the development of irrigation systems
C) the emergence of agriculture
D) extended periods of cold and dry weather
E) the emergence of efficient transportation systems

A) egalitarian organization
B) lack of social differentiation
C) concept of citizenship
D) lack of administrative bureaucracies
E) dependence on informal leadership