Which organ is considered as the "Graveyard of $RBCs$" where most of them are destroyed by macrophages?

The liver does not synthesize which of the following proteins?

Which one of the following is correct?

Statement-$I$ : Two surface antigens may be present on the $\text{RBCs}$.
Statement-$II$ : Antigens are chemicals that can induce immune response.

Globulins contained in human blood plasma are primarily involved in:

If a man $Rh^+$ marries a lady $Rh^-$,then