What will happen to the populations of developed countries during the next few decades and beyond? They will _____

A group of chemists, who have been working together on a new diet pill for the last four years, meet to discuss their new drug

Over the years, they have all come to respect each other and have formed a close bond. Upon discussing the effectiveness and safety of the diet pill, many members of the group found themselves agreeing with most of the comments that were made. Somewhere along the way, no one seemed to pay much attention to the fact that some of the subjects in the clinical trials of that drug became ill. It seemed that because nobody wanted to disrespect anyone else, the topic of ill subjects was dropped. What psychological phenomenon occurred here? A) Social facilitation B) Group polarization C) Groupthink D) Social loafing

According to the article Zipping Up the Genes about twins reared apart, variance in scientific studies is

likely to be the result of differences between individuals studied and (a) error in measurement (b) careful control of studies (c) statistical analysis (d) all of these--a, b, and c--are correct