The periodic table was createdby grouping elements according to their properties. Oxygen is a gas that has 6 valence electrons and is colorless. Which of the following unknown element would be grouped along with it? A. Boron B. Selenium C. Aliminum D. Phosphorou

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.