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:
Ratified June 15, 1804. The 12th Amendment changed a portion of Article II, Section 1. A portion of the 12th Amendment was changed by the 20th Amendment. The 20th amendment changed the dates that presidential terms and Congressional sessions started.he Twelfth Amendment cannot be understood outside of the Electoral College, which was set out in the 1787 Constitution as the mechanism by which Americans select their presidents. There were four crucial aspects of that mechanism.