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Bruce E · Answer 1 · 2017-07-18T21:42:58+0000

in this question there are four answers one of which i think is the uncovering of the land bridge that connects the two continents (because) in this multiple choice answer you cannot choose both boat and bridge.

Nupadhyaya · Answer 2 · 2017-07-24T09:10:44+0000

They migrated by boat and crossed the land bridge that formed across the Bering straights during the ice age when ocean levels fell. so they could discover a new world and new land.

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