Fertility is finite for mammalian females. From birth, females possess a limited number of primordial follicles, collectively called the ovarian reserve. Within each follicle is an oocyte that eventually becomes an egg. But with age, the follicles in the ovarian reserve decrease.
The roof of a house is seen in the ancient village of Aceredo that had been submerged by Limia river in the 1990s after the dam was built in Concello de Lobios, Spain, February 10, 2022. REUTERS/Migu