Which combinations of memory tasks would prove most difficult to the average older individual?

By 80 years of age, about what percentage of muscle mass is lost?

A. 10% B. 20% C. 30% D. 40% E. 50%

The structure in the hindbrain that controls certain reflexes and coordinates the body's movements is the __________

a. medulla b. cerebellum c. pons d. reticular formation