why are epithelium tissues mostly linings of boddy cavitites

Dear Student.

The correct term is body and cavities.

Epithelial tissues almost covers the whole body surface, the cells  are closely packed together and form continuos sheets. Epithelial tissue serves the purpose of protection, absorption, secretion and lubrication, that is why they form the lining of all internal and external body surfaces.  

Hope this information will clear your doubts about the topic.
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