Ovulation basics, please help!!?

Ovarian follicle is the basic unit of female reproductive biology and is composed of roughly spherical aggregations of cells found in the ovary. They contain a single oocyte (aka ovum or egg). These structures are periodically initiated to grow and develop, culminating in ovulation of usually a single competent oocyte. These eggs/ovum are only developed once every menstrual cycle (i.e, once a month).