Average life span of human $RBC$ is

The process by which blood cells are formed in the bone marrow is known as:

$A$ person injured in a road accident does not have a known blood group and requires an immediate blood transfusion. $A$ doctor friend offers to donate blood immediately. What would be the blood group of this doctor?

The $pH$ of the blood is maintained by balancing the ratio of

Does our blood have proteases and nucleases?

The graveyard of $RBC$ is: