Rhythms of wakefulness and sleepiness lasting about one day are called _______ rhythms

Research with animal subjects

a. is on the decline because computer simulations of animal nervous systems are so accurate, compelling, and useful. b. has been largely replaced by the use of tissue cultures. c. has been shown to have only limited value to understanding human problems. d. has yielded valuable discoveries that have benefited our species. e. is increasing because of the ease of availability of experimental animals.

Many ____ cultures value silence, especially in children, and view children who talk frequently as immature and low in intelligence

a. European b. American c. Eastern European d. Asian