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this muscle 'closes' or bends the joint when it contracts (so the angle between the bones decreases).
blood vessels that transport deoxygenated blood from the heart to the lungs.
birds without a keel on their breastbones and therefore unable to fly, for example ostriches....
chlorofluorocarbons (CFCs) are organic compounds that contain carbon, chlorine and fluorine.
muscles that work in pairs and are responsible for causing movement in opposite directions in...