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Universal Knowledge Library: Human Body
Humans have a bilaterry symmetrical body characterized by a backbone, hair, mammary glands and highly developed sense organs. Human body is composed of living cells and extracellular materials organized into tissues, organs and systems. Powered by the heart, it is the body's distribution system supplying oxygen, hormones and essential nutrients to the organs that keeps it alive. Billions of microscopic parts work together to make the human body function as a whole. Read more.
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