Final answer:
Forensic investigators divide the medulla into five different groups based on the color and structure of the hair: air medulla, interrupted medulla, fragmented medulla, continuous medulla, and pigment medulla.
Step-by-step explanation:
Forensic investigators divide the medulla into five different groups based on the color and structure of the hair. These groups include:
- Air Medulla: Medulla is absent, and the hair appears transparent.
- Interrupted Medulla: Medulla is present, but intermittent or broken.
- Fragmented Medulla: Medulla appears fragmented or fused together.
- Continuous Medulla: Medulla appears as a continuous line.
- Pigment Medulla: Medulla appears pigmented or filled with color.
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