321. What is the term that refers to the unofficial barriers that can block women from promotion into upper levels of management or responsibility at work? 322. In reference to women, what is their “second shift� 323. List three factors that affect the average income earned by different ethnic groups. 324. What is monogamy? 325. Name the three brain chemicals involved in pair-bonding and parenting behavior in humans as well as other species. 326. In Helen Fisher’s experiment, which brain region lit up the most on the brain scans among students who were passionately in love? 327. List the three components of love, according to Robert Sternberg’s triangular theory of love. 328. Many cultures view marriage as a vehicle to provide economic security and to cement relationships between the families joined by marriage. In these cultures a bride and groom might meet for the first time on their wedding day or girls are married by 12 years of age or younger to reduce promiscuity and strengthen clan relationships. These marriages are referred to as what type of marriage? 329. In Sweden, the practice of cohabitation is extremely common and results from what belief? 330. Explain why age is one of the strongest predictors of marital success.