$Rh$ factor is named after:

What is the approximate lifespan of white blood cells (leukocytes) in humans?

Which one of the following plasma proteins is involved in the coagulation of blood?

How many statements is/are incorrect?
$(A)$ Blood is a special epithelial tissue
$(B)$ Albumins are needed for clotting
$(C)$ Plasma with the clotting factors is called serum
$(D)$ Plasma is a straw coloured, viscous fluid

One of the factors required for the maturation of erythrocytes is . . . . . . .

Which of the following is true for blood group '$O$'?