Arnold $J$. Quick is associated with the discovery or study of which vitamin?

Erythroblastosis fetalis (hemolytic disease of the newborn) is observed in marriages between:

In a normal healthy person,if the total number of $WBCs$ is about $9000 / mm^3$,then the number of Agranulocytes is about . . . . . . $/ mm^3$ of blood.

Which of the following modified proteins is responsible for spontaneous blood clotting?

Highest content of iron is found in

In $.....$,blood cells are produced by the bone marrow.