Which of the following is a technique for eliminating nightmares that involves making the upsetting dream familiar while the person is awake as well as "mentally re-programming" future dream content?

A fundamental point about adaptation is that

(a) we adapt to the status quo (b) sensory adaptation occurs only in vision (c) adaptation reduces our sensitivity to changing environmental circumstances (d) adaptation is a very rapid process, normally taking about 7 to 10 minutes

About 30% of the world's population has a dietary deficiency of what nutrient?

salt iodine iron B-complex vitamins