Flatulence - The release of gas built up in the small and large intestines; a fart, Esophagus - The tube that passes food from the throat to the stomach, Digestion - The process of turning food into simpler materials that the body can use, Serum - A body fluid, Mucus  - A sticky substance produced by the nose and respiratory system, Phlegm - A thick mucus produced by the respiratory system during illness, Glands - An organ or tissue that make substances the body needs to function,

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