why blood group is defined as Positive or negative?
The "Rh factor" on the surface of their red blood cells. Red blood cells contain D antigen.The D antigen is usually indicated by Rh positive (Rh+ does have the D antigen) or Rh negative (Rh− does not have the D antigen).Contain Rh factore of red blood cells which blood group... বাকিটুকু পড়ুন

