what is the major difference between the two-dimensional and three- dimensional models of ethane and methane? when might you choose to use a two-dimensional model rather than a three-dimensional model when representing one of the molecules?

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.