Final answer:
The integumentary system includes the skin, hair, and nails, which all serve to protect the body, sense the environment, and help maintain homeostasis. The correct component that is not part of the integumentary system is D. teeth.
Step-by-step explanation:
The integumentary system consists of various components that contribute to the body's overall protection and homeostasis. It includes the skin, hair, and nails. These parts of the integumentary system have vital physiological functions such as providing a protective covering for the body, sensing the environment, and aiding in homeostasis. This network of structures also works as a barrier against harmful microorganisms and toxins, while the hair and nails, containing the protein keratin, provide strength and toughness.
The correct answer to the question "The integumentary system consists of all except" is D. teeth. Teeth are not considered a part of the integumentary system; rather, they belong to the skeletal system and play a role in mastication (chewing) and speech.