The excerpt that best demonstrates the constitutional principle of separation of powers is:
“Every Bill which shall have passed the House of Representatives and the Senate, shall, before it become a Law, be presented to the President of the United States.”
This excerpt illustrates separation of powers by showing the distinct roles of the legislative branch (Congress) and the executive branch (the President) in the lawmaking process. The requirement for a bill to be presented to the President after passing both houses of Congress delineates the responsibilities and powers of the different branches of government.