[Solved] The __________ is the longest prenatal period. A) period of the embryo B) period of the zygote C) period of the fetus D) first trimester Menstrual Cycle: The regular natural cycle of hormone-driven events in females of reproductive age, including menstruation, ovulation, and the potential for fertilization. Ovarian Cycle: The series of events in the ovaries that occur during the menstrual cycle, including follicle development and ovulation. Erotic Potential: The capacity or ability of an individual or entity to evoke or experience sexual feelings and reactions. Breasts: Glandular organs located on the chest of females and some males, primarily involved in lactation and also considered as secondary sexual characteristics.