How do animals of the same species get to other landmasses like bears being in the Americas and Eurasia?
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Earth has experienced regular Ice Ages for the past several hundred thousand years. During a period of glaciation sea levels drop and land bridges form.
During the last ice age the Bering straight was a land bridge connecting North America to Asia. England was attached to the European Mainland, most of the Philippines and many Pacific islands in the South China sea were connected to the mainland.
Camels originated in North America and migrated over the Asia and then Central Asia before becoming extinct in North America.
While Bears and Wolves seem to have migrated to North America from Asia.
Humans are also believed to have first come to North America this way, although a number of South American peoples appear to have arrived by boat.
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