Please select the word from the list that best fits the definition material moves in one large mass

Ifound this on google “your outer ear collects sound waves and reflects them into a tiny tube called the ear canal. at the end of the ear canal is a thin, skin-like membrane stretched tightly over the opening, called the eardrum.” i hope this you for what your looking for

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .