Which $WBC$ has the maximum lifespan?

$A$ 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?

Assertion $(A)$: Blood coagulates in uninjured blood vessels.
Reason $(R)$: Uninjured blood vessels release an anticoagulant heparin.

With regard to the $ABO$ blood typing system,if a man who has type $B$ blood and a woman who has type $O$ blood were to have children,what blood types could the children have?

What are Formed Elements?

Between persons of which two blood groups is the blood transfusion not possible?