what is mean by epithelial tissue
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Epithelial tissues are thin tissues that cover all the exposed surfaces of the body. ... They are also free from blood vessels and nerves and are supported by a connective tissue called the basement membrane.
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Pure calcium carbonate can be produced from marble, or it can be prepared by passing carbon dioxide into a solution of calcium hydroxide. In the later case calcium carbonate is derived from the mixture, forming a grade of product called "precipitated calcium carbonate,” or PCC.
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