Why does the female need a thick uterus if feterization docent occur?

A thick uterus, or endometrial lining, is important for several reasons, even if fertilization does not occur. It prepares the body for potential implantation of a fertilized egg, providing a nutrient-rich environment. Additionally, a thicker lining can help regulate hormonal cycles and support overall reproductive health. If fertilization does not take place, the lining is shed during menstruation, which is a natural part of the reproductive cycle.