In camels,$RBCs$ are .....

The $\text{WBCs}$ which make up the maximum count amongst leucocytes are $:-$

Which type of white blood cells are associated with the secretion of histamine and the anticoagulant heparin?

$A$ person with an unknown blood group ($ABO$ system) has lost a large amount of blood in an accident and needs an immediate blood transfusion. $A$ friend of the person has a valid certificate of their own blood group and is ready to donate blood without delay. What could be the blood group of the donor friend?

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

Mention the types of white blood cells $(WBCs)$.