The lifespan of human $R.B.C.$ is .......

Which of the following is true regarding white blood cells $(WBCs)$?

$A$ person with an unknown blood group under the $ABO$ system has suffered significant blood loss in an accident and requires an immediate blood transfusion. $A$ friend,who has a valid certificate of their own blood type,offers to donate blood without delay. What would be the blood group of the donor friend?

In a healthy individual,every $100 \text{ mL}$ of blood contains $........$ grams of hemoglobin.

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

Which of the following statements is correct regarding the composition of blood and lymph?