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Explanation:

taking a bath requires the most water out of the given options because it takes a significant amount of water in order to fill a bathtub.

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.