Question

what is the need of having different blood groups??
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Answer 1

Answer:

Generally blood group is decided by antigen and they are mainly A and B.... each and every blood group gives description about the nature of body..it means...human blood types most likely came to exist to fend off infectious disease...

Answer 2

Answer:

hey

Explanation:

There are two main antigens that form around our red blood cells, they are known as A and B. So, if your blood type AB, then you have both the A and B antigens. Type O lacks the A and B antigens, so the antibodies of a type O patient would attack A or B blood from a transfusion.

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