Which of the following terms is in its plural form?

This is a foreign substance that stimulates the production of an protein to inactiviate it.

This is a lab test that tests the ability of the blood to clot:

The combining form  immun / o  means:

This is a disease characterized by the lack of insulin secretions:        

What do the letters in the abbreviation,  RA  stand for ?

The letter B in the abbreviation, CBC  stands for:

This term describes a person’s own genetic ability to fight off disease:

The combining form relating to the hind brain is:

The term that means  “headache”  is: