FTP, identify this type of cell, which contains the pigment hemoglobin, and which is the most numerous type of blood cell, developing from erythroblasts.
They have a life span of about four months, after which time they are destroyed in the spleen and liver.  In most vertebrates, they are nucleated ovoids, but in mammals they are disc-shaped and without nuclei.  FTP, identify this type of cell, which contains the pigment hemoglobin, and which is the most numerous type of blood cell, developing from erythroblasts.
They have a life span of about four months, after which time they are destroyed in the spleen and liver.  
erythrocytes (accept red blood cell on early buzz)