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   ocr: MOVEMENT LL LIVING organisms move, A. a - although in plants the Muscle Muscle movement might not be obvious. contracts to contracts Animals move to escape predators, straighten tol bend to find food or a mate, or to avoid arm arm something unpleasant, for example. Movement usuallyinvolves muscles Bone pulling on a skeleton. In Joint some invertebrates, such as insects, the skeleton Combined action is outside the body. Mammals and Muscles often work in pairs, other vertebrates have a skeleton one contracting and pulling inside the body, made ofbones. while the other relaxes. A joint is where b ...