One in eight residents of the U.S. population aged 50 to 65 has difficulty walking three city blocks. For those who need to walk farther than that distance for work, this is an example of a(n) ______

Geoffrey has a Stanford-Binet IQ score of 60 and deficits in adaptive behavior. He is likely to be considered ______

a. mildly retarded c. severely retarded b. moderately retarded d. profoundly retarded

During the first year, an infant's sounds become increasingly _____, which means that the baby produces them for a specific goal

A) differentiated B) intentional C) vegetative D) telegraphic