________________, a series of roughly parallel lines of varying width, depth, and separation, are scratch marks caused by irregularities or a lack of microfine smoothness on the barrel of a gun, head of a firing pin, or working face or edge of a tool.

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The definition describes striations, which are often used in forensic ballistics to help identify the firearm or tool used in a crime. The other answer choices are unrelated to the description provided.

________________, a Series of Roughly Parallel Lines of Varying Width