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Breathing and skeleton (breathing (Inhaling (muscles in ribs contract…
Breathing and skeleton
breathing
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Bell jar model
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The same process happens to the jar, the pressure decreases and air rushes in, then it increases and air is forced out
skeleton
Bones
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They contain spongy bone, compact bone on the outside of it and the bone marrow
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Joints
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diagram 
purpose
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blood cells
The bones produce blood cells, which are vital for the body
movement
bones are joined to muscles, and the skeleton helps muscles move