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quizmad

18th November 2012, 15:56
How many blood groups are there.
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kilowatt

18th November 2012, 15:58
4 i think, A, B, AB and O
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grandpa gruffalo

18th November 2012, 17:00
A, Ab, B and O are the main blood groups but each may be rhesus positive or negative, making 8 major groups
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chrise

18th November 2012, 17:04
There are many more minor ones too - very difficult to give an answer.
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