The pilgrims came to the new world primarily for religious reasons; however, the signing of the mayflower compact showed that they also understood the importance of
a. land ownership.
b. economic systems.
c. agricultural methods.
d. political cooperation.

D. Political cooperation
The mayflower compact was an agreement of all colonists on board to work together for the equal benefit of all.

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.