Group O is the universal donor as they have no antigens for the antibodies to attach to therefore they won't be rejected by another blood type
They however have anti-a and anti-b antibodies therefore they need to recieve blood with no antigens as if they recieve antigens a or b, the anti a and anti b antibodies will attach to them and this causes agglutination which is bad. O is the only type with no antigens.
Group A can recieve from Group O and A as A has the same antigens and antibodies as the current blood anyway so there will be no agglutination and the blood won't be rejected. This is as the anti-B antibodies can attach to the A antigen. They can donate blood to group AB as AB has no antibodies and A and B antigens so giving more A antigens to attach to no antibodies won't cause a problem
Group B can recieve from Group B and O and it can send to Group B and Group AB
Group AB can recieve from anybody- universal recipients as they don't have any anti bodies but have both A and B antigens so can recieve both.
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