Migration into Northern Asia: The Bering Land Bridge, Not Ocean Levels

False. The statement "Delayed migration into northern Asia was due to ocean levels" gets the mechanism backward.

Lower sea levels (by ~120 m / 400 ft during the Last Glacial Maximum, ~26–19 ka) exposed the Bering Land Bridge—a ~1,000-mile-wide grassland corridor (Beringia) connecting Siberia and Alaska. This enabled human (and megafauna) migration from Asia into the Americas, not the reverse.

Migration into northern Asia (Siberia) occurred much earlier (~45–30 ka) via interior routes, facilitated by warmer interstadials and mammoth steppe productivity—not by ocean levels. The "delay" in reaching the Americas was due to the Laurentide and Cordilleran ice sheets blocking southward passage until ~15–14 ka, when an ice-free corridor (or coastal kelp highway) opened.

So: Low oceans → Land Bridge → Migration TO Americas. High oceans → Bridge submerged → Isolation.