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:
The framers of the Constitution were wise to provide a way for the  document to be amended. They realized that society would change as  time passed, and new issues they coulâ¦d not foresee might come up.  So, the framers made the Constitution changeable, but hard to do  so, so that it could not be changed on a whim.