Any substance that causes abnormal prenatal development is classified as a(n) _______________

According to the introductory discussion of bilingualism,

a. more than half of the people in the world are at least partially bilingual. b. technically, a multilingual is someone who speaks two different languages that have different historical origins. c. a speaker's first language is the language that she or he currently speaks most fluently. d. the majority of the world's bilinguals learned their second language during high school.

Historically speaking, the case of Phineas Gage, a railroad worker who was injured in 1848, is important because it provides evidence for a link between

a. verbal and motor behavior. b. the brain and complex psychological processes. c. near-death experiences and motivation. d. intellectual faculties and equilibrium.