Which of the following give rise to macrophages?

Given below are two statements:
Statement $I$:
The coagulum is formed of a network of threads called thrombins.
Statement $II$:
Spleen is the graveyard of erythrocytes.
In the light of the above statements,choose the most appropriate answer from the options given below:

In the human population,what percentage of individuals possess the $Rh$ antigen (in $,\%$)?

Which are the phagocytic cells from the given diagram?

In humans,the normal blood pressure is maintained by the blood protein called

Agglutinogen is .....