Scientists are using dna fingerprinting to identify the bodies of those killed in the 9/11 tragedy. most on-site evidence is in the form of bones or teeth. yet the evidence supplied by the victims' families may include hair or tooth brushes. how are scientists able to compare dna from bones or teeth to that found in hairs on a hairbrush? a) they cannot and this is making body identification very difficult. b) each sample provides an exact karyotype for genetic identification. c) dna is the same in every cell of the body and does not change over time. d) the dna must all come from the hair in order to be accurate.