Which are characteristics of epithelial cells? Select two options. are unable to be used for secretion of materialsmain cells of the nervous systemfound lining many areas that contact the external environmentplays a role in protectioncarry oxygen through the bodymake up the skeletal muscle

Epithelial cells form sheets that line body surfaces and many spaces that contact the external environment, such as the digestive tract and airways. They also help protect the tissues beneath them, so C and D are correct. Epithelial cells can also secrete materials, making A false; the other choices describe nervous, blood, or skeletal muscle cells.

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