Tell me the name please
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Which of these is a density dependent factor? a. epidemic b. earthquake c. drought d. hurricane

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!

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.