The primary function of the reproductive system in mammals is to ensure the production of offspring and the continuation of the species. This system includes structures involved in gamete production, fertilization, and nurturing developing young. In females, it is responsible for the formation of eggs, gestation, and lactation, while males produce sperm and facilitate fertilization. Beyond reproduction, the system plays roles in sexual selection and genetic diversity, influencing evolutionary adaptations that enhance survival and resilience within fluctuating environments.