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101. If teenagers marry because of an unintended pregnancy, they are _____ likely to drop out of high school and _____ likely to get a divorce, compared to pregnant teens who don’t marry or who marry after the birth of the child. a. more; more b. less; less c. more; less d. less; more 102. According to the text, prior to about 1995, most developmental researchers believed that brain development during adolescence was __________; today most researchers believe that brain development during this period of the lifespan is_________. a. complete; still underway b. still underway; complete c. fast; slow d. complex, simple 103. Advances in which of the following fields has been of primary importance in helping researchers understand that brain development during adolescence is much more dramatic than had previously been thought? a. human nutrition b. genetic counseling c. self-monitoring research d. magnetic resonance imaging 104. According to the text, the development of fMRI techniques has allowed developmental researchers to investigate brain development more effectively because this technology allows them to perform which of the following types of research? a. cross-sectional research b. longitudinal research c. experimental research d. correlational research 105. By the time a person reaches the age of 6, that person’s brain has reached _____ of its full adult size. a. less than 50% b. about 67% c. about 80% d. 95% or more 106. With respect to gray matter in the brain, the period of adolescence is best characterized by the word(s): a. growth in number of cells b. pruning c. enlargement of cells d. increase in complexity of cell connections 107. The volume of gray matter in the brain peaks for girls at about age _____ and for boys at about age _____. a. 2; 2½ b. 9½; 10½ c. 16; 18 d. 40; 44 108. During adolescence, the volume of gray matter in the brain _________ and the volume of white matter _________. a. decreases; decreases b. increases; increases c. increases; decreases d. decreases; increases 109. Dr. Jones is studying brain changes during adolescence. In looking at MRIs of people age 12 and people age 18, he should expect that the 12-year-olds will have ______ gray matter and _______ white matter in their brains, compared to the 18-year-olds. a. more; more b. less; less c. more; less d. less; more 1 The white matter in the brain in composed mostly of: a. cell bodies b. connective tissue including tendons and cartilage c. bone d. nerve cells surrounded by myelin

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