We divide our energy use among four economic sectors: residential, commercial, transportation, and industrial. Heating and cooling our homes, lighting office buildings, driving cars and moving freight, and manufacturing the products we rely on in our daily lives are all functions that require energy.
When neither are present, you have type O blood. When an antigen is present on the RBC, then the opposite antibody (also called agglutinin) is present in the plasma. For instance, type A blood has anti-type-B antibodies. Type B blood has anti-type-A antibodies. Type AB blood has no antibodies in the plasma, and type O blood has both anti-type-A and anti-type-B antibodies in the plasma. These antibodies are not present at birth but are formed spontaneously during infancy and last throughout life. In addition to the ABO blood group system, there is an Rh blood group system.
Our blood is composed of blood cells and an aqueous fluid known as plasma. Human blood type is determined by the presence or absence of certain identifiers on the surface of red blood cells. These identifiers, also called antigens, help the body's immune system to recognize it's own red blood cell type.There are four main ABO blood type groupings: A, B, AB, and O. These blood groups are determined by the antigen on the blood cell surface and the antibodies present in the blood plasma.Antibodies (also called immunoglobulins) are specialized proteins that identify and defend against foreign intruders to the body. The antigens on the blood cell are B and the antibodies in the blood plasma are A. 2  Type AB: The genotype is AB. 3  The antigens on the blood cell are A and B. There are no A or B antibodies in the blood plasma. 4  Type O: The genotype is OO.