1-What is a blood group? 2-How do we get our blood groups? 3-Who discovered the different blood groups? 4-When were they discovered? body: 1-What are the different blood groups? 2-What are the blood antigens? Where are they located? 3-What are the blood antibodies? Where are they found? 4-How are antigens and antibodies different in each group? 5-How can we identify our blood group? 6-Which blood group is the universal donor? 7-Which blood group is the universal recipient? Conclusion: What decides whether the blood transfusion would be successful or compatible between a donor and a recipient?