If a person has type "O" blood they have both the "A" and "B" markers on their red blood cells.

Name: If a person has type "O" blood they have both the "A" and "B" markers on their red blood cells.
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If a person has type "O" blood, it means they have neither the "A" nor the "B" markers on their red blood cells. They have only the "O" marker, which is why it is known as the universal donor blood type.

If a Person Has Type "O" Blood They Have Both