In leukemia (blood cancer),the number of white blood cells (WBCs) is -

Write a short note on $ABO$ blood grouping.

Which organ is known as the 'graveyard of red blood cells'?

What is the typical maximum concentration of $Hb$ (hemoglobin) found in $RBC$s (in $\%$)?

Match the type of blood cells in Column $I$ with their respective structure in Column $II$ and function in Column $III$ and select the correct option given below.

Column $I$	Column $II$ $\&$ $III$
$I$. Erythrocytes	$D$. Enucleated,biconcave circular in shape; $N$. Transport of gases $O_2$ and $CO_2$.
$II$. Neutrophils	$A$. Spherical large cells,nucleus with many lobes; $O$. Phagocytic in function.
$III$. Lymphocytes	$C$. Spherical nucleus,agranular cytoplasm; $M$. Humoral and cell-mediated immunity.
$IV$. Thrombocytes	$B$. Cellular fragments small,oval shaped; $L$. Clotting of blood.

Choose the correct option regarding the components of blood and lymph.