Explain the reason why it is difficult to asses the relative importance of a single factor (physical or natural) for population distribution.

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.

she recieved a treatment not thought to be specifically effective in treating her disorder.

answer; beware of exaggerated claims without supporting evidence;