The fruits of plants in Brassicaceae are always (). A: siliques B: drupes C: aggregate follicles D: achenes

Not contained in primary follicles A: Primary oocyte B: Follicular cell C: Zona pellucida D: Cumulus

The follicular cells of the thyroid follicles become ( )shaped when they are in an active state.() A: squamous B: cuboidal C: irregular D: columnar E: oval