People with type ab blood are considered the "universal recipient" for transfusions because their blood is plentiful in a and b antibodies. they are usually rh negative. their blood lacks a or b antibodies. their blood cells lack a and b antigens. they usually have very strong immune systems.

The correct answer is their blood lacks A or B antibodies.

People with type AB blood have A and B antigenes on the surface of red blood cells (RBCs). AntigenAB  has no antibodies, thus, transfusion can be considered safe ( the serum of the recipient does not contain antibodies for the blood cell antigens of the donor).

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.