Astudy in the 1980s found a link between drinking coffee and increased risk of pancreatic cancer. this study failed to consider the fact that many heavy coffee drinkers are also smokers. smoking, and not coffee, may have been what cause the increased risk of pancreatic cancer. in this example, smoking

a.
random variation

b.
a confounding variable

c.
a placebo

d.
an epidemic curve

Can you receive a shock severe enough to prevent you from releasing the wire from an ordinary outlet with dry hands?

Which of the following can be effective in preventing the onset of viral infection in humans? a) taking vitaminsb) getting vaccinatedc) taking antibioticsd) taking drugs that inhibit transcription

If scientists are trying to use what they know about hsv to devise a means of protecting other people from being infected, which of the following would have the best chance of lowering the number of new cases of infection? a) vaccinate of all persons with preexisting cases of hsvb) interfere with new viral replication in preexisting cases of hsvc) treat hsv lesions to shorten the breakoutd) educate people about avoiding sources of infection