This document provides information about the male and female reproductive systems. It identifies and labels the main parts of each system, including the penis, testes, sperm ducts, ovaries, uterus, cervix, and vagina in the male system and ovaries, oviducts, uterus, cervix, and vagina in the female system. It also summarizes the process of fertilization, including the release of sperm and eggs, fertilization occurring when a single sperm fuses with an egg, and the formation of a zygote through rapid cell division.