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Guest Posted 22 years ago
Grammar

Blood type A or O

Hello!
I wonder what blood O positive means and what blood type A negatvie means. My friend asked me about this today but i have not the least idea about it.
thanks in advance.
don (liuzhou,China)
  

Top answer

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1 Answers
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Check this out:
http://sln2.fi.edu/biosci/blood/types.html

Miriam
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