The shape of the nucleus of $WBC$ is usually

To whom can a person with $A^+$ blood group donate blood?

Properties of leucocytes are:
$I$. They are nucleated.
$II$. They are denucleated like $RBC$.
$III$. They are $6000-8000 \; mm^{-3}$ of blood.
$IV$. They are long-lived.
$V$. They are short-lived.
Choose the appropriate option with correct properties.

Blood group $AB$ has

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

The rate of erythropoiesis is controlled by