Final answer:
Hairline, bone structure, and widest/most dominant areas are considered in anthropology to understand human physical characteristics and variations.
Step-by-step explanation:
When analyzing hairline, bone structure, and the widest/most dominant areas, one subject that comes to mind is anthropology. Anthropologists study human physical characteristics and variations, including the features mentioned in the question. They use these factors to understand and classify different populations and their evolutionary history.