Who proposed the idea that learning relies on networks of uniform and unlabeled connections?
a) herbert simon b) w. k. estes c) edward tolman d) david rumelhart

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.

the secretary of defense is the principal defense policy advisor to the president. under the direction of the president, the secretary exercises authority, direction, and control over the department of defense.

as you did not provide any choices for me to choose from to give you a direct answer, this is the only information i can provide.

'migration rates' are measurements of how many people entering or leaving a country. and if more people are leaving, this could cause a population to change.