Why does exercise us sleep better? a. exercise a few hours before bedtime us relax so we sleep better at night. b. intense workouts make our bodies tired, so sleep comes easier. c. exercise does not us sleep better. d. both a and b.

Patients in outpatient treatment centers and day treatment programs a.attend meetings at hospitals b.live at home c.stayin the clinic in the evenings and on the weekends d.live in the treatment facility

How do nicotine and tobacco cause cancer? by decreasing blood-sugar levels by damaging or changing a cell's dna by increasing heart rate by increasing phlegm and mucous production

Which of the following represents the results of a review of well-controlled studies of vitamin c supplementation on the resistance to, and recovery from, colds? there was a reduction in the duration of colds by 50% on the average. there was a slight effect on reducing the duration and severity of colds for people taking vitamin c supplements. there was a significant reduction in the duration of colds in people who consumed at least one gram a day. there was a significant reduction in the number of colds only in people who consumed > three grams per day.