What is the advantage of studying adopted children? 1. researchers can isolate genetic traits and study only the influence of environmental factors on individual development. 2. researchers can study whether genetics or the environment plays a stronger role in shaping individual behavior. 3. researchers can study the genes that are responsible for specific traits of an individual. 4. researchers can study the environmental factors that are responsible for a specific behavioral trait.

Voters commonly condemn politicians for being insincere, but politicians often must disguise their true feelings when they make public statements. if they expressed their honest views—about, say, their party's policies—then achieving politically necessary compromises would be much more difficult. clearly, the very insincerity that people decry shows that our government is functioning well. which of the following, if true, most seriously undermines this reasoning? (a) achieving political compromises is not all that is necessary for the proper functioning of a government. (b) some political compromises are not in the best long-term interest of the government. (c) voters often judge politicians by criteria other than the sincerity with which they express their views. (d) a political party's policies could turn out to be detrimental to the functioning of a government. (e) some of the public statements made by politicians about their party's policies could in fact be sincere.