Human blood is group

Human blood is grouped into 4 different blood types: A, B, AB, and O. Our blood type group is determined from birth. Experts explain that each blood group has different characteristics. from fit6 http://ift.tt/2i6Fiwf via alanafalk.jimdo.com from Tumblr http://ift.tt/2j58d80 via alanafalk.jimdo.com