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acid Africa alcohol allergy animals antelopes areas arteries Asia baleen whales bear become biofeedback blood vessels body bones brain breathing called cancer capillaries carbon dioxide cats cause cavity centimeters chromosomes circulatory system color deer develop diet digestive disease dolphins drugs ears elephant emotions example feel female fluid function genes glands growth hair heart hind human hunt impulses incisors infection influenza intestine kidney known learning legs live liver lungs lymph male mammals marijuana marsupials membrane ment meters miacids mole monkeys mouth movements muscles nerve fibers nervous system nicotine normal organs oxygen pairs patient person pouch prey primates produce protein rats red blood cells result rodents seals shrew skin sleep smoking sometimes species spinal cord stomach substances surface tail teeth tion tissue transplant trees tube upper usually uterus veins vitamin whales World monkeys young