A person's blood type is determined by "the presence ... These factors help define the eight most common blood types: A positive, A negative, B positive, B negative, O positive, O negative ...

Blood type is determined by "the presence or absence ... There are eight common blood types: A positive, A negative, B positive, B negative, O positive, O negative, AB positive and AB negative.

If you don't know your blood type, you're not alone. However it is important medical information to know, and here's how you can find it. Macy Meyer is a North Carolina native who graduated from ...

Human populations that left Africa evolved quickly whereas Neanderthals stayed the same, according to an analysis of blood ...