Many fine motor skills require two hands and thus two sides of the brain. therefore, it is most likely that an immature and less myelination may underlie many of the problems that children have in developing these skills.

The correct answer in the space provided is the corpus callosum. It is because it is responsible for having to allow communication between the two hemisphere on the brain and if it is weak or immature, it will likely cause a child to have a problem in the way his or her brain works or how he does things. 

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.