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:
An amendment to the Constitution is a change that can add to the Constitution or change an older part of it. An amendment can even overturn a previous amendment, as the 21st did to the 18th. There are a few methods to amend the Constitution, but the most common is to pass an amendment through the Congress, on a two-thirds vote. After that, the amendment goes to the states, and if three-quarters of the states pass the amendment, it is considered a part of the Constitution â it has been ratified.