Final answer:
The late migration mentioned likely refers to the coastal route used by ancient populations migrating from northeastern Siberia into the Western Hemisphere, following marine food sources like kelp southward to South America before moving inland.
Step-by-step explanation:
The late migration of the NCC, possibly referring to neural crest cells or a population group (context required for precision), is intriguing when considered in a historical context. For human migration, a significant pathway is described through the so-called kelp highway hypothesis. This hypothesis suggests that ancient populations might have migrated from northeastern Siberia into the Western Hemisphere by boat, utilizing a coastal route southward while relying on abundant marine resources like kelp, fish, and sea mammals as food sources. Such a migration pattern likely supported their sustenance and expansion into new territories, including as far south as Chile in South America.
During this migration, these populations might have then diverged into different groups, moving inland and adapting to new environments, thus leading to the spread and temporal changes in their expansion areas. The study of these migration paths provides valuable information about the spread dynamics of ancient human populations and their colonization routes.