An example of a variable in a frequency distribution is ____.

All of the following are systemic conditions that can cause an increased predisposition to periodontal diseases except one. Which one is the exception?

A) Diabetes mellitus B) Vitamin A deficiency C) AIDS D) Neutropenia E) Stress

The epididymis is:

A) a long, straight structure B) located in the upper abdomen C) about 10 feet in length D) shaped like a half-moon