define all blood groups
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there are 4blood group a,b,ab,o, they are positive or nagative like a+b+ab+o+
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Answer:Blood groups. There are four main blood groups (types of blood) – A, B, AB and O. Your blood group is determined by the genes you inherit from your parents. Each group can be either RhD positive or RhD negative, which means in total there are eight main blood groups.
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