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 the separation of powers by showing how the legislative branch (Congress) and the executive branch (the President) have distinct roles in the law-making process. The requirement that both houses of Congress must pass a bill and that the bill must then be presented to the President for approval or veto exemplifies the checks and balances that limit the powers of each branch.