Ключевые слова: background, biology, care, cell, cells, childbirth, concept, dna, egg, embryology, estrogen, female, fertility, fertilization, figure, flat, gamete, genetic, gynecology, health, hormones, human, infertility, insemination, lay, male, man, medical, medicine, microbiology, object, ovum, physiology, pink, pregnancy, reproduction, reproductive, science, semen, sperm, spermatozoa, spermatozoon, swimming, system, testosterone, top, treatment, view, violet, woman,