Within the United States, what group has the highest rates of death from heart disease?

Once in the uterus, the zygote

a. stops dividing into more cells. b. becomes implanted immediately. c. wanders around for 3 or 4 days before becoming implanted. d. is now called a fetus.

Low intensity, incomplete responses indicating that energy is beginning to accumulate in an instinctive behavior system is typical of which type of behavior?

a. fixed action patterns b. intention movements c. prepared behaviors d. appetitive behaviors