How is the united kingdom's parliamentary system of government different from the united states' federal system? a. in the parliamentary system, power is held by one person or a small group that rules by force, while in a federal system the legislative branch chooses the leader. b. in the federal system, there is no clear separation between the executive and legislative branches, while in the parliamentary system there is. c. in the parliamentary system, the head of the executive branch is also a member of the legislature, while in the federal system the head of the executive branch is elected separately. d. in the federal system, the legislative branch both creates and executes the laws, while in the parliamentary system a prime minister determines which laws to enforce.