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It is not that O+ is a rare blood group,the fact is O+ blood do not accept blood from all groups.

Blood group of donor                                     Blood group of recipient

A                                                                    A and AB

B                                                                    B and AB

AB                                                                  AB

O                                                                    O,A,B and AB

'AB'-Universal recipient (will receive any kind of blood groups)

'O'-Universal Donor (can donate blood to any kind of blood group)

But O can accept only O blood group and will not accept any other.
  • Brainly User
IT is not that O is the rarest blood group but this blood group people are UNIVERSAL DONORS, means they can give blood to people of any other blood group but can receive blood from people of O blood group only..

mark mine as best n clcik thbk
clcik thnk u