Question 13 What do the Arabs, Persians, and Kurds have in common?
Most members live in Israel.
Most members practice Islam
Most members are nomadic herders.
Most members support terrorism against the U. S.
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What is the answer

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.