Ключевые слова: baby, biology, birth, calendar, cell, clock, competition, concept, condom, contraception, cycle, day, dna, doctor, egg, female, fertile, genetic, gynecology, health, hormone, human, man, medicine, menses, menstrual, menstruation, newborn, ovary, ovulation, paper, period, person, pills, planning, pregnancy, pregnant, process, procreation, reproduction, science, semen, sex, silhouette, sperm, test, time, uterus, watch, woman,