A complex number can be visually represented as a pair of numbers (a, b) forming a vector on a diagram called an Argand diagram, representing the complex plane. Re is the real axis, Im is the imaginary axis, and i is the imaginary unit which satisfies i2 = â1.
When discussing blood types, the two groupings most commonly used are the ABO (A, B, AB, O) and Rh (+, -) systems. The least common blood type in humans is Bombay (EXTREMELY râ¦are), which is a type O with missing H antigen. Otherwise, of the normal ABO and Rh typings, the least common group is AB-.
The most common element in the biosphere is nitrogen. Of the formed elements of blood, the three main kinds are erythrocytes (red blood cells), white blood cells (leukocytes, granulocytes, neutrophils, eosinophils, basophils, lymphocytes, monocytes, etc.), and platelets. Red blood cells are the most numerous.