____________ theory proposes an explanation of referred pain based on the close proximity of the interneurons in the spinal cord

Which of the following is NOT one of the basic rules for forming plurals of words?

a. Abbreviations are formed into plurals by adding an s. b. Plurals of nouns can be formed by adding an s. c. Plurals of nouns can be formed by adding es. d. Abbreviations are formed into plurals by adding es,

The lethal dose (LD 50/30 ) of radiation for humans is estimated to be

A) 4,500 grays. B) 450 grays. C) 45 grays. D) 4.5 grays.