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The human body is a complex and highly specialized organism that has evolved over millions of years to perform a wide range of functions necessary for survival. Every part of the body, from the brain to the toes, plays a vital role in maintaining overall health and well-being. The nervous system, which includes the brain and spinal cord, controls all bodily functions, while the skeletal system provides support and structure. The circulatory system transports oxygen and nutrients throughout the body, and the digestive system breaks down food into energy-rich molecules.