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In the body, when you group together related cells they form what is known as tissues. The human body is made up of 4 primary tissues known as the epithelial tissue, the connective tissue, the muscle tissue and the nerve tissue. Each organ, besides the skin, has a specific function that it must perform. There are many organs but some man organs are the liver, the kidneys, the lungs, the heart, the pancreas and the stomach.
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