since I don't know if this is multiple choice or not, im going to assume its the symptoms of a heavy smoker
Flashlight, Firestarter, Compass,
How are organs and tissues for transplantation obtained?
<span>Are organ and tissue transplants experimental
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The second line of defense of the immune system, also an aspect of innate immunity, is the nonspecific resistance. These defense mechanisms destroy invaders in a general way and do not target specific antigens.
