Hunger and thirst are classified as:

In the late 1800s, the drug laudanum, comprised of ______, was widely used in patent medicines

a. heroin mixed with cocaine c. opium dissolved in alcohol b. morphine laced with aspirin d. cocaine blended with mescaline

Red-green color blind individuals do not have a severe difficulty with traffic lights because

a. the red light is always on top and the green light is brighter than the red. b. the "red" traffic signals have blue light mixed in with the red. c. the "green" light is really yellow­green. d. all of these are utilized.