Question
What are the different blood groups in human$?$

Answer

The blood group of an individual human being always remains unchanged throughout their life. Karl Landsteiner described that human blood can be divided into four groups, i.e. $A, B, AB$ and $O.$ These are named on the basis of substance present in the blood $(RBC).$ Every man has one of these four groups of blood which is inherited from parents to offspring and is never changed. If a person gets injured and heavy blood loss occurs, there is a need to give blood of other person to the patient. The person who gives the blood is called donor while the person who receives the blood is called
recipient.

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