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You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring

What is the balance to the equation?

How is it possible for someone to put an ear to a wall and hear someone in the next room?     a.sound waves can travel though solids.    b.the waves travel from room to room via air.    c.there must be some air in the wall so the sound can travel through it.    d.sound waves change to electromagnetic waves and then back again.