29 Forensic science plays an important role in the investigation of serious crimes. One of the first significantachievements in the field was the development of techniques for identifying individuals by their ______. In the 19thcentury, it was discovered that almost any contact between a finger and a fixed surface left a latent mark that couldbe made visible by a variety of procedures.
(A)blood
(B)saliva
(C)semen
(D) fingerprints