How do block grants reflect cooperative federalism

The answer is: They function at the state level but are funded by the national government

Cooperative federalism refers to a system where both the states government and the federal government are working side by side in order to solve a common problem.

For cooperative federalism to occurs, both the state and federal government need to play an active role in the same project (such as providing funding and managing operation).

uhh idk for sure but i think it makes it difficult to pump the oil through the oil rigs

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.