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Which of the following is an example of a specific body defense mechanism?
Bacteria
Single-celled microorganisms that exist in various environments, some beneficial to humans and others pathogenic.
Vitamins
Organic compounds required in small amounts for normal metabolism and not synthesized in sufficient quantities by the body.
Hepatic Portal Vein
A blood vessel that carries blood from the gastrointestinal tract and spleen to the liver.
Anorexia Nervosa
A psychological disorder marked by an extreme fear of gaining weight, leading to severe restriction of food intake.
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