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

In human blood,the oxygen carrier is

$A$ person with antigens '$B$' in $RBC$ and antibodies '$a$' (anti-$A$) in the plasma belongs to the blood group

Sex chromatin is found in the ....... of:

Which of the following statements are correct?

$A$. Basophils are most abundant cells of the total WBCs

$B$. Basophils secrete histamine, serotonin and heparin

$C$. Basophils are involved in inflammatory response

$D$. Basophils have kidney shaped nudeus

$E$. Basophils are agranulocytes

Choose the correct answer from the options given below:

Megakaryocyte cells are .....