Children’s pronunciation errors are random and unpredictable

George has participated in multiple events in his after-school track program, and shown improvement between ages 9 and 12. According to studies conducted at the University of Michigan in the 1980s, George most likely benefits from considerable change during middle childhood in all of the following except

a. running speed. b. jumping ability. c. throwing ability. d. flexibility.

Mia and her doctor need to know as quickly as possible (hopefully within 24 hours) whether the child she has been carrying for only nine weeks possesses any genetic abnormalities. Which technique is Mia's doctor most likely to employ?

a. Chorionic villus sampling b. Ultrasound c. Amniocentesis d. Genetic counseling