Question 21 - Reading: Level A Practice Test for the TABE Test

There are many theories regarding the first human migration into the Western Hemisphere. Because of changing global climate conditions and the retreat of glaciers toward the end of the Pleistocene epoch, new lands opened to migrating animals and the humans who were likely hunting them (Wooller et al. 2018). As always, because of limited and ambiguous artifact and fossil findings, the primary pieces of evidence are open to multiple interpretations. Upon examining the range of theories, two primary arguments are apparent. …

• The interior route, also called the Bering Strait theory, is the best-known and most accepted theory for the first human migration into the Americas. The foundation of this theory is the Beringia “land bridge,” which connected northeast Siberia and what is now Alaska when sea levels were lower due to glacial ice formation on the continents. This theory proposes that the earliest human habitants of the Americas crossed this marshy land on foot, most likely beginning around 15,000 years ago based on artifacts and dating sequences. The Beringia land bridge was alternately exposed and submerged multiple times over the earth’s history. According to the interior route theory, the earliest humans crossed this marshy land in pursuit of migratory herds of mammals and then proceeded to filter southward, splitting into multiple groups, some of which penetrated into the interior of North America as they continued to move east and south.

• The coastal route is also based on the migration of a northeastern Siberian population into the Western Hemisphere, but by boat rather than on foot. This theory, sometimes called the kelp highway hypothesis, proposes that the earliest migratory populations followed the continental coastline southward, subsisting on kelp, fish, shellfish, birds, and sea mammals. Research by archaeologist Jon Erlandson (Erlandson et al. 2007; Ocean Wise 2017) suggests that migrants may have followed these food sources all along the continental shelf, a shallow sea area near the shore. Some believe that they eventually reached as far south as Chile, in South America, before breaking into groups and penetrating the interior lands.