Average life span of human $RBC$ is

Which one of the following blood cells produce antibodies as an immune response of the body?

Analogy type questions:
$(1)$ Human $RBCs$ : Enucleated : : $WBCs$ : ......
$(2)$ $'O'$ blood group : Universal donor : : $'AB'$ blood group : ......

Name the blood cells whose reduced count causes excessive loss of blood from the body due to a defect in the blood clotting process.

Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin?

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