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It has been hypothesized that humans arrived in North America by crossing a land bridge in...

It has been hypothesized that humans arrived in North America by crossing a land bridge in the far north between what is now Asia and North America (the Bering Bridge). If this is so, does it represent a dispersal event or a vicariance event for our species? Explain.

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In simple terms, dispersal event in biogeography is believed to occur when the species willingly migrate themseleves to a new habitat and colonise the new region. In this case species use their own power/energy.
A vicariance event occurs when a population is seperated by geographical barriers such as mountain ranges. In this case energy is provided by the environment.
As humans arrived in North America by crossing the Bering Bridge on their own, it is a case of dispersal event.

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