Diving into shallow water can lead to all of the following blunt spinal injuries, EXCEPT:

Penicillins are divided into ________ groups of varying spectrums of activity

A) two B) three C) four D) five

A measure of the dispersion of a distribution, calculated as the ratio of particle size below which 84% of the particles occur to the particle size below which 50% occur, in a log-normal distribution is termed

a. count mode. b. count median diameter (CMD). c. mass median diameter (MMD). d. geometric standard deviation (GSD).