In a test on the effects of air pollution, groups of students performed a reaction-time task in either a polluted or an unpolluted room. Students in the unpolluted room were exposed to conditions.

How does the principle of federalism affect the u.s. government? a. it guarantees that the united states will always be a representative democracy b. it ensures that the state governments have greater authority that the federal government c. it creates both separate and overlapping powers for the federal and state governments d.it divides the federal and state governments into three branches