When an egg is fertilized, the sperm contributes ____ chromosomes

When adolescents are employed over 15 hours per week during the school year, they

a. improve their organizational skills and they get better grades in school. b. are more likely to experience anxiety and depression. c. save their money for long-term goals (e.g., a car, college tuition). d. learn the value of money.

Dr. Martinez is a psychologist who uses systematic desensitization to help his client, Catherine, address her extreme fear of heights. What technique is Eduardo likely to use?

a. ?Each week, Eduardo and Catherine take an elevator to the 50th floor of his office building and go outside on the observation deck. They stand close to the edge while he reassures her that everything will be alright. b. ?Eduardo teaches Catherine relaxation techniques then gradually, through guided imagery, asks her to imagine herself in a high place. If she starts to feel anxious, they temporarily return to the relaxation techniques. c. ?Eduardo and Catherine repeatedly visit a scenic viewpoint at the top of a hill. They have a pleasant picnic there, gradually moving to picnic tables that are closer to the top of the hill. d. ?Each week, Eduardo and Catherine take an elevator to the 50th floor of his office building and go outside on the observation deck. They stand there in silence while she internally works through her fear.