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How many human blood groups are there?

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How many human blood groups are there?
posted May 28, 2020 by Divya Bharti

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1 Answer

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There are four blood groups in the ABO system, which are O, A, B, AB, and each of these can be either Rh(D) positive or Rh(D) negative.

answer May 29, 2020 by Anuradha Tabyal
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