(If there are no antigens at all on the surface of the red blood cells, all three possible antibodies are present in the blood plasma: A, B and Rh antibodies.). The blood type notation O Rh-indicates which antigens and antibodies are present in the blood.
There were 2,473 billionaires in the world, as of Wealth-Xâs last count through 2015. That was a 6.4 percent increase in billionaires from the year before. But who these billionaires are and what theyâre like is more difficult to discern.
This graph shows the number of billionaires in the United States from 1987 to 2012. The number of billionaires in the U.S. has increased tenfold during this time, from 41 billionaires in 1987 to 425 billionaires in 2012.