bone - a hard structure inside some animals bodies., skeleton - bones and other structures that provide support to the body., cartilage - a strong and flexible material within the skeleton., joint - two or more bones that come together., hinge joint - bones that move back and forth like a door. ex: elbow and knee, ball and socket joint - bones move in a circle. ex: shoulders and hips, Muscle - structure that contracts and relaxes to produce movement, Contracts - muscle gets shorter, Relaxes - Muscle gets longer, Feather - lightweight, flat structure that forms the outside covering of birds body, fin - flattened structure on the outside of a fish, scales - stiff, flattened plate that forms a protective covering on the outside of an animal, exoskeleton - a hard cover on the outside of some animals bodies , camouflage - a structure used for protection in order to blend in with its environment , quill - a type of hair that is hard and sharp; serves as a structure for protection ,

Science: Structures Used for Support, Movement and Protection

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