In approximately _____ of the cases of mental retardation there is an identifiable biological cause;the most common of these is _____.
A) one-third;fetal alcohol syndrome
B) one-third;Down syndrome
C) one-quarter;fetal alcohol syndrome
D) one-quarter;Down syndrome

Question

Quizplus · Accepted Answer

Fetal alcohol syndrome is the most common identifiable biological cause of mental retardation, accounting for approximately one-third of cases.

In Approximately _____ of the Cases of Mental Retardation There