The ____________________ is the most inferior level of the brainstem

The average smoker will die how many years earlier than nonsmokers?

A. 5-6 B. 10 C. 13-14 D. 17

All people have about the same number of _______________, regardless of skin color. What varies from person to person is how active the cells are in producing melanin. 

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