4 words in this vocabulary list
noun the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen.
verb to expose (a room) to fresh air in order to rid it of foul odors or impurities.
adjective relating to or consisting of epithelial cells, which are cells forming the outer layer of the skin and the surface layer of mucous and serous membranes
noun a part of the body of a vertebrate containing the digestive organs; the belly
noun a medical condition characterized by an excess of a specified substance in the blood