Dr. Sport studies gross motor development in children; specifically, Dr. Sport is interested in how children's ball throwing changes over the course of development. He is interested in studying

Mary notices that her 3-year-old seems to have difficulty when he tries to stop running. When coming to a quick stop, he often tips forward, nearly falling on his face

From a developmental perspective, this boy's difficulty most likely stems from having: a. a higher center of gravity than an older child would have b. weaker leg muscles than an older child would have c. poorer peripheral vision than an older child would have d. an underdeveloped inner ear, which will develop more fully by age 6

The common term "nervous breakdown" probably would be considered in clinical diagnostic terms to mean

a. a psychotic disorder. b. a phobia. c. an adjustment disorder. d. a dissociative disorder.