. A sample of an unknown composition was tested in a laboratory. The sample could not be broken down by physical or chemical means. On the basis of these results, the laboratory reported that the unknown sample was
most likely

where are the vectors ?

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

increase masses, decrease separation

im sorry i dont know