Sagot :
Blood type O (letter D) is known as the universal donor.
The types of blood is also classified by "rhesus/ Rh". It refers to your blood if it has antigen or none. If it has antigen, it is called as Rh+. If none it is Rh - .
Blood type o- is considered as the universal blood because they can give it to people having different blood types without risking a transfusion reaction.
Blood type o- is considered as the universal blood because they can give it to people having different blood types without risking a transfusion reaction.