You have a strand of hair from a crime scene but can’t tell if it is from an intruder or the family dog. if the hair otherwise looks similar on initial examination, you’d want to examine the: medulla nucleus root follicle

i took this class the answer is medulla because investigators may look for the presence or absence of a medulla, which is a set of cells that runs through a hair. The medulla is typically different depending on which species the hair came from. This is one way to distinguish between animal and human hair.

c is the correct answer hope this !