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a system of veins which carries blood from the digestive tract to the liver.
hypersensitivity to a substance that is usually harmless
(also called renal failure) the condition in which the kidneys are no longer able to function...
an abnormal response of the immune system to the protein in certain foods.
(also called autotrophic organisms) organisms that produce their own organic food, mainly...
an animal that feeds mainly on grasses.