In addition to genetic contributions to personality traits, your text mentions which of the following factors as also playing a strong contributing role to the development of these traits?

In regards to education, a person born in a developing nation would most likely ____

a. only complete primary school b. complete primary and secondary school c. complete primary school and vocational training d. complete secondary school and college

By age 40 years, many individuals in midlife experience sleep problems. What are the consequences? Adults in midlife are ____

a. less likely to experience the deepest type of sleep b. more likely to have nightmares c. more likely to fall asleep on the job d. less likely to have appropriate bone density