Adaptive immunity can be acquired during either 'naturally' (by infection) or 'artificially' (through deliberate actions such as vaccination). Adaptive immunity can also be classified as 'active' or 'passive'
Because second hand smoke can and will affect the lungs of everyone who is around, not just the smokers
Life is the seemingly endless cycle of the repetitious processes of the mind altering psychoactive dispositions of intricate and faulty human responses to stimuli.
D, sodium isn't good, also work out some more
