epithelial proper noun, singularcells noun, pluralon preposition or subordinating conjunctionthe determinersurface noun, singular or massare verb, non-3rd person singular presenthighly adverbkeratinized verb, past participle, so adverbas adverblong adverbas preposition or subordinating conjunctionit personal pronounis verb, 3rd person singular presentunbroken adjective,
so preposition or subordinating conjunctionwe personal pronounfind verb, non-3rd person singular presenta determinerspecial adjectivetype noun, singular or massof preposition or subordinating conjunctionstratified verb, past participleepithelium noun, singular or masscalled verb, past participlekeratinized verb, past tenseepithelium noun, singular or mass, which wh-determineris verb, 3rd person singular presentwhat wh-pronoun