blood type. Any of the four main types into which human blood is divided: A, B, AB, and O. Blood types are based on the presence or absence of certain substances, called antigens, on red blood cells.Also called blood group.lood type. Any of the four main types into which human blood is divided: A, B, AB, and O. Blood types are based on the presence or absence of certain substances, called antigens, on red blood cells.
Amendments are sent to the legislatures of the states by default. Only one amendment, the 21st, specified a convention. In any case, passage by the legislature or convention is by simple majority. The Constitution, then, spells out four paths for an amendment:
Not counting the Bill of Rights, the Constitution's been changed seventeen times since its ratification. The change to the Constitution is called an Amendment. See List of amendments to the United States Constitution and Article Five of the United States Constitution. It's been changed with 27 amendments on 18 separate occasions, as recently as May 7th, 1992. It's tough to do, but clearly not impossible.