 Xenoestrogen makes the uterine walls thinner and fragile.When comparing fish from above a wastewater treatment plant and below a wastewater treatment plant, studies found disrupted ovarian and testicular histopathology, gonadal intersex, reduced gonad size, vitellogenin induction, and altered sex ratios.The sex ratios are female biased because xenoestrogens interrupt gonadal configuration causing complete or partial sex reversal.