A biological cycle, or rhythm, that is approximately 24 hours long is called a(n) ______ cycle

Around ages 4 to 6, the libido migrates to the genitals during the __________ stage

a. phallic b. oral c. anal d. genital

According to your textbook, the single biggest contributor to health problems in the United States is a. overeating

b. smoking. c. alcohol consumption. d. taking illegal drugs.