The sight of a syringe has been noted to produce in a heroin addict a sudden desire for a "fix" and he begins twitching. Such reactions were not present until the syringe was seen. We can say that the syringe has become

According to To Catch a Coldabout stress and the immune system, following initial assessments,

participants were (a) exposed to five separate individuals infected with various cold viruses (b) injected with one of five different cold viruses (c) exposed to one of five cold viruses using nasal drops (d) put in stressful situations and then immediately exposed to a cold virus

Being a major social influence in childhood, birth order dictates that the _____ child will experience a sense of dethronement

a. first-born c. youngest or last-born b. second-born d. third-born