Dill's most noticeable physical characteristic is that he is

Dill's most noticeable physical characteristic is that he is "short".

Charles Baker "Dill" Harris is a short, keen kid who visits Maycomb each late spring from Mississippi, and remains with his Close relative Rachel. Dill is the closest companion of both Jem and Scout, and his objective all through the novel is to get Boo Radley to leave his home.

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.

Earthquake fault lines. map above represent