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:
There are two ways to change the Constitution of the United States, formally and informally.   There are several ways to informally change the Constitution. One examp â¦ le is Article I, Section 8, Clause 18. It is known as the âelastic clauseâ because it âstretchesâ the power of Congress.