The old phrase "the straw that broke the camel's back" is an example of how frustration can be increased due to

Abraham Lincoln suffered through periods of profound depression throughout his life. What do some historians believe his mood disorder can be traced to?

a. his poverty-stricken upbringing on the Western frontier b. his father losing his property due to faulty property titles c. the death of his mother when he was nine years old d. insomnia

Which of the following are examples of agonist types of treatment for substance abuse.

a. the use of methadone to treat heroin addict b. a nicotine patch or nicotine gum to treat addiction to cig smoking c. buprenorphine for the treatment of opiate addiction d. All of these