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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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The presence of a follicular antrum within the granulosa layer distinguishes secondary follicles from primary follicles. This space is filled with a fluid called liquor folliculi. The oocyte and the zona pellucida are also visible in this image. The theca interna, which produces hormones, surrounds the follicle.