<prompt> Primary and secondary markings over metal bullet help in?Identification of weaponIdentification of woundIdentification of personSeverity of tissue damage  <response>: Markings on the bullet are used to identify the gun used. Bullet finger printing -Study of comparison of markings on crime bullet test bullet under comparison microscope Primary MarkingClass Characteristics: Produced by rifling groovesQ Primary markings are used to identify the make model of the guns involved. Secondary markings or individualaccidental characteristics Produced by irregularities by manufacturing process are different for each gun produced by same manufacturer. They are useful in identifying the specific gun which was fired. 