Why is O blood a universal donor? 🤔 | Easy science lesson
O- is the universal donor! O negative blood type information and top ways to give
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The Universal Donors - Type O Negative Tribute - Tom Malenski Benefit - Ottobar 3/6/2015
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'This is a gift' says universal blood type donor
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Why O negative is called a universal donor?? | SIMPLE AS THAT
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