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Which of the following consists of skin and its accessory organs, such as oil and sweat glands, sensory receptors, hair, and nails?

  1. Circulatory

  2. Digestive

  3. Endocrine

  4. Integumentary

The correct answer is: Circulatory

The correct answer is D. Integumentary. The integumentary system consists of the skin and its accessory organs, such as oil and sweat glands, sensory receptors, hair, and nails. This system is responsible for providing a protective barrier for the body, regulating body temperature, and sensing the environment. The other options (circulatory, digestive, and endocrine) do not encompass the skin and its related structures as part of their functions.