One comment on “Understanding Blood Types for Survival

  1. The universal blood donor is O negative. It can be given to anyone. I am A negative and can only recieve A- and O-. My body can not take any positive blood as my blood will see it and destroy it, improbably killing me. Rh positive and Rh negative will be visible to the naked eye as they react to mixing them. Like blood brothers did. Rh negative comprises only 7% of the worlds population.

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