Question

what in the medical world was first classified into the A.O.B. system in 1920​

Answer 1

Answer:

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Explanation:

Answer 2

The medical world was first classified into the A.O.B. system in 1920 is "blood".

• AOB system or ABO system basically related to the blood groups. The name come from group A, group B, group AB and group O.
• Blood is a continually flowing fluid that provides nutrition, oxygen, and waste elimination to the body. Blood is essentially liquid, yet it contains various cells and proteins that make it "thicker" than pure water. The typical person's blood volume is roughly 5 litres.