shoulderblades are manly for structure and general protection for the body...
they help with structure because if they weren't there, your shoulder would be several inces closer to the center of your body so you'd not be able to move then as freely as you can...
and they help with protection in the same way as ribs, they just stop hard things getting into the chest cavity...
i'm only 15 and have no specific interest in osteology so i'm not intirely sure but i am, however, logical by nature so my answers shouldn't be too far off the facts...
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