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Giving our skin color
Shape and support
Some made up word
The hardening of your bones as you get older
Turning into a fossil
A skin disease
A disease of the bone that will lead to a greater risk of fracture.
Hinge joints (like the knee and elbow)
Pivot joint (between the skull and spine)
Stick joint (the arm)
Ball and socket joint (hip and shoulder)
Wait, is this even a question?