- A Integumentary system
- B Muscular system
- C Skeletal system
- D Respiratory system
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Answer:
A
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The integumentary system is the protective covering of the body. It includes the skin, hair, nails, and glands. The skin is the largest organ of the body and serves to protect the body from external threats such as injury, infection, and dehydration. It also helps regulate body temperature, excrete waste, and synthesize vitamin D.
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