9. identifies and measures the amount of ethanol molecules making up a substance and uses n-propynol as an internal standard. a. Gas Chromatography
b. Head Space Gas Chromatography
c. Gas Chromatography-Mass Spectrometry
d. Spectrophotometer

Depression is lifelong, though you can get medication to with it. the difference between sadness and depression is that sadness lasts a little bit, depression last a long time and it goes on and off. people usually get depression through experiences they have been through, or genetics.

Dang it i was gonna answer but yeah its c

The answer to this is true

The answer is corticosteroids