How many chwhich of the following statements about tobacco products is true?
a.
tobacco products contain over 4,000 different chemicals.
b.
all chemicals found in tobacco products are carcinogens.
c.
cigarettes are the least used tobacco product.
d.
tobacco products are difficult to obtain.
emicals in tobacco products have been proven to cause cancer?

If you feel pain while stretching, you should do any of the following except: a. stretch farther. b. back off the stretch. c. find an alternative. d. stop stretching.

Which of these pieces of safety equipment should be worn when operating a chainsaw

Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.