All the following are symptoms of periodontal disease EXCEPT ____________

Variable expenses, those expenses that do not remain constant, are ____________

a. laboratory costs b. mortgage c. dental supplies d. both a and c

The ____ secure(s) the chordate tendineae (heart strings) that open the two leaflets of the mitral valve.

A. pulmonary muscles B. inferior muscle bundle C. papillary muscles D. mitral muscles