A study is done that examines the current rate of disease frequency against other factors. This type of study is called

The ability of a solution to resist a change in pH when either an acidic or alkaline substance is added to the solution is known as its:

A) Chemical composition. B) Isotonic level. C) Compatibility. D) Buffer capacity.

The fraction bar, which separates the numerator and denominator in a fraction, also means:

A. multiplied by B. added to C. divided by D. subtracted from