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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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late_primary_follicle_labels
When follicular cells proliferate into a stratified epithelium known as the zona granulosa, the follicle reaches the late primary follicle stage. This image shows the zona pellucida even more clearly.