You are correct in thinking there are more than three blood types. There are actually four blood types, they are O, AB, A and B. There is also something called Rh factor. It is either present(+) or absent(-).
They can have a lot of blood-types
Learning what 4 blood types there are is a fairly simple task. Most easily, asking your doctor can be very effective. If you do not have a doctor to consult, many donation centers have information regarding blood types. Learning what type of blood an individual has is easily determined at a doctors office, donation center, or places of a similar profession.
No, there are different types of blood cells, each with specific functions. The main types of blood cells are red blood cells, white blood cells, and platelets. They vary in size, shape, and function.
There are many good books on blood types. The book "Blood Types" is a simple one to start with. It lists all blood types and what the different types mean.
compadibility with other blood types
3
there are 8 types of blood a+, b+, o+, ab+,a-,b-,o-,ab-
There are negative and positive of A, B, AB, and O. That means that there are 8 different blood types. Your blood type is determined based upon your mother and fathers blood types. O negative is the rarest blood type.
13
There are three types of blood vessels. There are veins, arteries, and capillaries.
4 blood AB, A, B, and O
No , there are many types of blood cells .