MASS SELLING, in contrast to personal selling: is less expensive when the target customers are numerous and scattered. doesn't provide immediate feedback. is less flexible in adapting to customers' needs and attitudes. All of these alternatives are correct.

disorders of the brain include both behavior disorders and other psychiatric illnesses. the primary difference between a behavior disorder and another type of psychiatric disorder is the presence of choice. psychiatric conditions are considered to be involuntary while in behavior disorders, choices are essential.

a) which ethnic groups live in this community?

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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.