Some psychologists believe that behavior is motivated by the body's attempts to achieve a state of balance in which the body functions effectively, or ______

The fMRI has several important advantages over the PET scan. Which of the following is not one of those advantages?

a) it can provide images of both brain structures and brain activities b) it requires no injections of radioactive tracers c) it can identify locations of activity with greater precision than a PET scan d) It can detect changes in under 5 minutes, versus the 20 minutes required by a PET scan

On which days is intercourse avoided with the calendar method?

A) Days 1–13 of the menstrual cycle B) Days 5–14 of the menstrual cycle C) Days 10–17 of the menstrual cycle D) Days 15–22 of the menstrual cycle