According to the data accumulated by the National Center for Health Statistics, the leading cause of death for late teenagers and early adults in the United States was clearly cancer

In comparison with adolescent thinking, adult thinking requires more

flexibility. stability. persistence. rationality.

Many people believe that the herb called St. John's wort can be used to treat depression. Researchers studying the effectiveness of this treatment have found:

A) that St. John's wort is not an effective treatment for depression. B) that St. John's wort is a very effective treatment for depression. C) that St. John's wort is effective, but not as effective as SSRIs. D) mixed results, with some studies finding an effect while others do not.