When the Europeans established colonies in Oceania is the 1800s, they inadvertently caused the native people to suffer from
A) disease.
B) famine.
C) poverty.
D) warfare.

A. When the British empire were exploring through the pacific islands the natives did not have immunity to disease and therefore most of the suffered

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.