Is the comlumbian exchange a big change in history? did it effect us now? ?

The positive and negative consequences of the Exchange became clear almost immediately. People on both sides reveled in new foods and animals that made their lives richer and easier, but suffered as well when old ways of life were disrupted.

do all equestions have to be answered

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.