Healthcare expenditures by Americans were approximately ____ trillion dollars in 2009.

The hard drive provides:

A) temporary space for information to be stored within the computer itself. B) permanent space for information to be stored within the computer itself. C) All of the above D) None of the above

Among adult individuals of the same gender, what is the most important factor that affects pulmonary function?

A. height B. race/ethnicity C. weight D. age