How much percent of plasma is water (in $\%$)?

What is the difference between lymph and blood?

$A$ man whose blood group is not known meets with a serious accident and needs blood transfusion immediately. Which one of the blood groups readily available in the hospital will be safe for transfusion?

$A$ doctor suggested a couple not to have more than one child because:

$A -$ Fibrinogen is needed for the clotting of blood,and globulins are involved in defense mechanisms of the body.
$R -$ Factors for the coagulation of blood are present in the blood in an inactive form.

The iron-free compound of haemoglobin is: