My answer is that you don't have a legitimately defined question. Please restate the question in reference to something. A & O may be blood groups in human.
No. Blood groups are inherited from your parents.
When you have negative blood you're automatically an universal donor. These groups have packed red blood cells. AB are receivers which mean they can receive any blood donated to them.
yes they do. they have at least 2 different blood groups.
If you mean Rhesus - it's a classification in blood groups of a lack of Rhesus anti-bodies.
In case any of you need an emergency blood transfer.
It means that their blood type is A+ (A Positive). Human blood is divided into several different groups based on unique antigen substances, found on red blood cells.
There are four main blood groups: A, B, AB, and O. These also have a negative and a positive, I.e A+, A-, and so on. This would mean that there are eight different types of blood group: A+ A- B+ B- AB+ AB- O+ O-
There are over 30 blood groups for horses, 8 of these are major groups and 7 are recognized internationally.
Blood groups are dertermined on the surface of the red blood cells and they have nothing to do with our immune system.
chicken's have blood group
A and AB