In mammalian $RBC$,the percentage of haemoglobin is

Which $WBC$ act as phagocytes?

When is thromboplastin released in humans?

Activity of phagocytosis occurs through

Select the correct Rh-blood groups of the parents,whose child is affected with erythroblastosis fetalis.

$A$ blood test of a person suspected of having anemia shows large,immature,nucleated,hemoglobin-deficient erythrocytes. Which of the following substances should be included in their diet to alleviate these symptoms?