Final answer:
Biological anthropologists have utilized genetic markers to investigate race, but they have consistently found that dividing the human population into racial categories is scientifically unjustifiable. Variation within categories exceeds variation between categories, indicating that biological notions of race are inaccurate.
Step-by-step explanation:
Biological anthropology has provided multiple lines of scientific evidence to test the biological notions of race. Researchers have examined genetic markers for physical characteristics such as skin color, hair texture, and blood type, among others. However, these studies have consistently found that there is no scientifically justifiable way to divide the human population into racial categories. The variation within categories is greater than the variation between categories, demonstrating that biological distinctions based on race are inaccurate and imprecise.