A major shift occurs in a baby's sense of self at around 8 to 12 weeks of age that is grounded in the concept of ________. 

By the beginning of the 20th century, a greater percentage of Americans were addicted to opioids than at any time before or since. Opium smoking and medical use of injected pure morphine were important contributors to this, along with

A. intravenous use of heroin. B. the growth of organized crime syndicates. C. patent medicines containing opium extracts or morphine. D. alcohol prohibition.

Both intelligence and occupational status are correlated with social-class background, a fact that

may account for the positive relationship between these two variables. Indicate whether the statement is true or false