Two scientists were working on an idea. They kept in touch by asking each other questions about which designs worked better . After months of experiments one of the scientists discovered a breakthrough. He tested it several more times and got the same result.

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.