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In your body, the outside "tube" that surrounds a cavity and inner "tube" is derived from the ________. see section 30.2 ( page 616) .

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This "tube" is derived from the endoderm. The endoderm is the innermost germ layer present in the earliest stages of the developing embryo. These cells will go on to become the epithelial lining of many systems as the embryo further develops.

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