BILAYERED ) THECA APPEARS FIRST IN __ OVARIAN | FOLLICLES Select one: ) Graafian primordial secondary primary

The correct answer is: Graafian.<br /><br />The bilayered theca, which consists of an inner theca interna and an outer theca externa, appears first in Graafian (or mature) ovarian follicles. This structure is responsible for the production of androgens, which are then converted to estrogen within the follicle.