How does your Skeletal and Muscular Systems work together? Muscles move your bones
Bones move your muscles
Heart pumps blood throughout the body
Your bones protect your muscles

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.