As you walk into an elevator, you notice the powerful scent of perfume left behind by someone who has just exited. By the time you reach your floor, you find that you hardly notice the smell anymore. What phenomenon is at work?

Mary Ainsworth conducted her research on human attachment

A) only in the infants' nurseries. B) only in the infants' homes. C) mostly in university labs. D) at local day care centers.

Suppose that the presence of a particular gene is a sufficient cause for the occurrence of schizophrenia

Which of the following statements is TRUE? A) All people with schizophrenia will have that gene. B) The gene is also a necessary cause for the occurrence of schizophrenia. C) There are other things besides this gene that can cause schizophrenia. D) A person with that gene may or may not become schizophrenic.