Eating, drinking, sexual motivation, and body temperature control are most strongly influenced by

your question is incomplete

explanation:

your answer would b. the missisipi river

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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.

answer; environmental science;