Serum differs from blood in

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?

$RBCs$ have an average life span of (in $days$)

The $pH$ of blood is

In camels,$RBCs$ are .....

To prevent coagulation,blood stored in a blood bank contains a small amount of: