Jamaal always wears a blue jacket when he takes his dog for a walk. Over time, Jamaal notices that when he wears other articles of clothing that are blue, his dog gets excited. This is an example of __________

Adrenal hormones are involved in ________

a. sleep. b. emotion and stress. c. daily biological rhythms. d. uterine contractions during childbirth.

Research on giving vitamin supplements to young children has found that these supplements ________

a. may improve the IQ scores of malnourished and well-fed children b. may improve the IQ scores of malnourished children, but not of children who are not experiencing malnutrition c. have no effect on the IQ's of the children who take them d. may improve the IQ scores of well-fed children, but not children who are malnourished