Agroup of scientists suspects that certain dietary practices are partially responsible for different rates of hypertension among adults of different ethnic/racial groups. to test their hypothesis, the researchers examine data concerning the different population groups' hypertension rates and their past dietary practices. this research is a study.

retrospective

Explanation:

Retrospective study: The given study looks backwards and identifies exposures to protection factors or expected risk related to an outcome that is established at the beginning of the study.

It investigates an issue or phenomenon that has happened in the past.

In retrospective studies, the research method utilizes and collect data about a person's experiences of past events.

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.

okay what's the question?