In 2010, Dale, Harlaar, Haworth, and Plomin completed a twin study in which they found evidence suggesting an important role for heredity in the ease with which adolescents learn a second language. Given this,
a. skill in foreign language was more similar among fraternal twins than among identical twins.
b. skill in foreign language was more similar among identical twins than among fraternal twins.
c. skill in foreign language was equal among fraternal and identical twins.
d. skill in foreign language cannot be evaluated using a twin study.
b
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