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1.My model needed two bones, the humerus and the radius and the ulna combined. My model needed 2 muscles, the triceps and the biceps.
2. They were similar because the both did the same. the triceps and the biceps pull my arm back and forth and the bones helped keep my arm sturdy, Like they did in the model.
3.The changes that they make are that they release and contract. They release to let go and contract to pull in.
4.If the ligaments were streched are arms would not hold together and they would become spaghetti. Are bones would not attach.