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The answer that fills in the blank is mucus. The mucus has the component of not being miscible with the element water because of it's properties. They have the components of being able to provide oil in a substance to make a movement in a smooth manner in the cells which are found in the mucosa, they also have the capacity of protecting them and providing moisture.
AC is the kind of electrical flow we get from a typical electrical outlet in a home. AC is when the electrons flow in two directions, from the positive to the negative terminal and from the negative to the positive terminal, 'alternating' between the two directions.
B. The air molecules are closer together in the upper stratosphere