Duffy,Kidd,and Lewis are the names of . . . . . . .

What is the main function of proteins in plasma?

Which is the appropriate pair?

Which instrument is used for counting red blood cells?

Identify the cells and their functions based on the provided figure:
$(a)$ Fig. $A$ - Megakaryocyte - formation of platelets
$(b)$ Fig. $B$ - Lymphocyte - synthesis of antibodies
$(c)$ Fig. $A$ - Eosinophil - secrete antihistamine
$(d)$ Fig. $A$ - Neutrophil - secrete heparin

The average life span of $RBCs$ is . . . . . . days.