Give three reasons why the great civilizations of Mexico, Central America, and South America were considered advanced.

well to answer ur question to be completly honest

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.

what is the question?

answer; beware of exaggerated claims without supporting evidence;