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Mechanics of Life: Muscles and Movement
Muscles move by contracting. Good posture and proper exercise help our muscles work efficiently.
Phoenix Learning Group, 2349 Chaffee Dr., St. Louis, MO 63146, Phone: (314)569-0211, Toll-free: 800-221-1274, Fax: (314)569-2834, URL: http://www.phoenixlearninggroup.com
Available on Running time 10 minutes.
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