Article I of the Constitution provides instructions for the legislative branch, which consists of Congress. To be a member of the U.S. House of Representatives, one must be 25 years old. To be a member of the U.S. Senate, one must be 30 years old. The main responsibility of the U.S. legislative branch is the making of laws. In the lawmaking process in the bicameral (two house, or part) U.S. Congress, when bills are introduced in the legislature they are first debated in a subcommittee before determining if they will be voted on. If a bill passes in one house, it must go through the entire process in the other house to be passed and sent on to the president for consideration. There are other legislative branch powers listed in the Constitution as well, such as the power to borrow money. The U.S. Constitution also contains the Necessary and Proper Clause, which is also known as the Elastic Clause. This clause allows Congress to stretch its power and pass any laws which are necessary in carrying out their enumerated powers. The Necessary and Proper Clause allows the legislative branch to remain flexible and adjust with circumstances that changing times require.