Skin is sometimes referred to as the largest organ of the body. Why is skin considered to be an organ and not a tissue or some other structure?
A. Skin consists of multiple cell types functioning as a single integrated unit.
B. Skin consists of a single cell type.
C. Skin is a vital component of multiple organ systems.
D. Skin consists of multiple tissue types that cooperate to perform a specific task.
Answer: D
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