B) 10 actitudes para afrontar esta pandemia.

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.

permafrost layer, it exists beneath a layer of soil, rock or sediment.

answer; /// the above statement is (true);