Snowstorm Sivir

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The human body is a complex system made up of trillions of cells, organs, and tissues that work together to keep us alive. The brain, which weighs about three pounds, controls everything we do from thinking to moving our muscles. It processes information from the senses and helps us learn and remember new things. The heart pumps blood throughout our body, supplying oxygen and nutrients to all our cells. The lungs breathe in air and release carbon dioxide through exhaling.