What type of epithelial cells cover endocrine and exocrine gland

The epithelial cells tend to be cuboidal in shape when they are inactive, but more columnar when they are actively secreting hormones. The epithelial cells accumulate iodine from the blood and use this element in the synthesis of thyroglobulin, a large glycoprotein which forms the colloid.

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i believe the answer is a

ground wouldnt be clean and the soap wouldnt be dirty