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What is a scale?
Skin
Decayed matter
Air
An accumulation of dry or greasy flakes such as abnormal or excessive dandruff
The correct answer is: An accumulation of dry or greasy flakes such as abnormal or excessive dandruff
A scale refers to an accumulation of dry or greasy flakes, such as abnormal or excessive dandruff, on the skin. Options A, B, and C are all incorrect as they do not accurately define what a scale is. Skin is a broad term that refers to the outer covering of the body, decayed matter is organic material in the process of breaking down, and air is a mixture of gases that make up Earth's atmosphere. None of these options relate to the definition of a scale. Therefore, option D is the correct answer.