Which of the following have the longest lifespan in the blood?

The universal donor is

Normal haemoglobin content of a healthy man per $100 \ ml$ of blood is about

Which $WBC$ has the maximum lifespan?

$Serum = .........$

When red blood corpuscles containing both $A$ and $B$ antigens are mixed with your blood serum,they agglutinate. Hence,your blood group is . . . . . . type.