Ira and Andrew were both adopted by the same parents when they were the same age. They are unrelated biologically but have been raised as brothers their entire lives. They would be an example of __________ twins.

Collectively known as ________, these conditions are defined by academic achievement below expectations for age, years in school, and IQ.

a. thinking disorders b. mental retardation c. specific learning disorders d. pervasive developmental disorders

On average, divorce is most likely to occur within the first ______ years of marriage

Fill in the blank with correct word