Bear

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The human body is a complex and intricate system made up of many different organs and tissues that work together to sustain life. The heart pumps blood throughout the body, delivering oxygen and nutrients to cells and removing waste products. The brain processes information from the senses, controlling movement, emotion, and cognitive function. The lungs breathe in oxygen and expel carbon dioxide through a process called respiration. The digestive system breaks down food into nutrients that can be absorbed by the body.