Yellow colonies on mannitol salt agar indicate the definitive presence of

Concurrent validity for a norm-referenced test can be estimated through ________.

A. ratings obtained through peer reviews B. administration of parallel forms of a test C. administration of parallel forms of a test and correlation of the two halves of the test D. tournament play E. correlation of the two halves of the test

When an antigen enters the body, specialized white blood cells called ________ produce antibodies, which in turn combine with the antigens to neutralize them. 

Fill in the blank(s) with the appropriate word(s).