Bacteria that grow best in the absence of oxygen are referred to as ________. 

Alzheimer's disease (AD) is a progressive disorder of the central nervous system.

Answer the following statement true (T) or false (F)

In addition to regular breast examinations, all women in good health should be encouraged to have a(n) ________ every year starting at age 40. 

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