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1. Circulatory system
2. Digestive system
3. Skeletal system
4. Muscular system
5. Reproductive system
6. Nervous system
7. Urinary system
8. Endocrine system
9. Others
i. Integumentary system (hair, nails, skin etc.)
l. Lymphatic system
These appear to be the main biological systems in animals (especially humans), though others may be added. There are also biological systems in plants.
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