How do nicotine and tobacco cause cancer?
a. by decreasing blood-sugar levels
b. by damaging or changing a cell's DNA
c. by increasing heart rate
d. 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.

Identify two ethical principles that can teens deal with difficult decisions

Some infants in poorer households are not fed this important food for all babies. what is it? a. baby food b. breast milk or infant formula c. water. d. all of the choices are correct