Risk for developing lung cancer for smokers varies due to all of the following except
a. factors like frequency of smoking and age of starting smoking.
b. inconsistently collected data.
c. other lifestyle risk factors.
d. variations in depth of inhalation of cigarette smoke.

the aorta is the large artery leaving the heart branches into smaller arteries, which eventually branch into capillaries.the arteries carry oxygen and nutrients away from your heart, to your body's tissues. the capillaries are small, thin blood vessels that connect the arteries and the veins. the statement that arteries carry oxygen-rich blood to capillaries is true. veins on the other hand are blood vessels that take oxygen-poor blood back to the heart.