Allowed people to settle in one area, instead of being nomadic.
a.
specialized farming
c.
hunting smaller game
b.
development of irrigation systems
d.
all of the above

answer; ///i believe the correct answer is the empire state building;

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.

answer; the above statement is (false);