The esophagus is a tube that carries food from the mouth to the stomach. it does not secrete any enzymes or absorb any nutrients, but it does need to stand up to significant friction and stress. the type of epithelium most likely lining the esophagus would be epithelium.

as many times as you want

most community's take hundreds of years to become stable

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

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