Why do civilizations need these characteristics in order to survive?

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Explanation:

A civilization is a complex human society, usually made up of different cities, with certain characteristics of cultural and technological development.In many parts of the world, early civilizations formed when people began coming together in urban settlements.

hope this helps :D

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.