Not all humans have the same type of blood. in different types of blood, certain antibodies and antigens may or may not be present. there are different systems for classifying blood, and one of the systems is the abo system. in this system, a person’s blood is classified as either type a, type b, type ab, or type o. the purpose of this system is to describe which types of blood are compatible. this means which types of blood can be taken from or given to a person. there are three principles that govern which types of blood are compatible.

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