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The reproductive system ensures the survival of the species. Other systems in the body, such as the endocrine and urinary systems, work continuously to maintain homeostasis for the survival of the individual. An individual may live a long, healthy, and happy life without producing offspring, but if the species is to continue, at least some individuals must produce offspring.
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Histology slide of the ovary
The ovaries are small, oval-shaped glands found on either side of the uterus. Midway through each menstrual cycle, the ovaries produce and release eggs (oocytes) into the female reproductive system. They also produce female hormones like estrogen and progesterone.
Each egg is initially enclosed in a single layer of cells called a follicle in the ovary, which also supports the egg. One egg is discharged from the ovary per menstrual cycle as these eggs mature over time.
Reference: Society for Endocrinology. (2018, February). Ovaries | You and Your Hormones from the Society for Endocrinology. Yourhormones.info. https://www.yourhormones.info/glands/ovaries/