In suppressing their cravings during the withdrawal period from nicotine, many people find that using nicotine patches or gum tend to help as well as medications, such as

_____ is a fear of unknown people common in infants at about 6 months and increasing in intensity until about 12 months, and then declining in the second year

a) Stranger anxiety b) The difficult temperament c) An insecure attachment d) Separation anxiety

The idea that the eye contains separate receptors for red, green, and blue is known asthe ______ theory

a. opponent-process c. additive color mixing b. trichromatic d. reductive color mixing