What is an advantage of mri over an x-ray?

a. it produces better images of hard tissue

b. it requires large equipment

c. it shows only external structure

d. it uses no radiation

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases. 

Answer lack of education;                   lack of protection                  lfailure of getting tested

Vitamin d for sure for american adults