“laboratories of federalism/democracy” relates to which advantage of federalism?

The  " laboratories of federalism/democracy "  which relates to advantage of federalism is that it provides store of innovation. Federalism promotes policy innovation as we see various states and local governments adopt different policies and laws which could be tested by other states and national government. Thus both states and national government can learn from each others successes and failures.

assuming that you are talking about the one in egypt: hecka oil

explanation:

an interest group is an organization whose members share common concerns, and try to influence government policies that impact those concerns. elected officials frequently complain about the influence of "special interests" on american politics.