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The human body is a complex and highly organized structure that is capable of functioning on its own without the need for external assistance. It has many different systems, each working together to keep the body healthy and functioning properly. These systems include the circulatory system, which transports blood throughout the body; the digestive system, which breaks down food into nutrients that can be used by the body; and the nervous system, which controls movement and sensation. The human brain is also a vital part of the body, as it processes information and controls many different functions such as movement and thought.