Asked by | 20th Jul, 2008, 04:31: PM
Basically there are 4 blood groups - A, B, AB and O.
These groups may be Rh+ve or Rh-ve depending on the presence or absence of Rhesus factor.
In addition, some other blood groups like M and N are also recognised, but not used much.
Kindly post each remaining question separately. We cannot answer such multiple questions.
Answered by | 20th Jul, 2008, 05:27: PM
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