How did Beringia allow plants and animals to move between Asia and North America?

During the Pleistocene Epoch, worldwide glaciation caused sea levels to drop by as much as 400 feet (120 meters), exposing a vast region of dry land known as Beringia. This land bridge periodically connected northeastern Asia and northwestern North America, creating a continuous overland route between the two continents.123

Although much of the Northern Hemisphere was covered by massive ice sheets, research indicates that Beringia remained largely unglaciated due to its dry climate. This environment supported cold-hardy tundra vegetation, which provided the necessary habitat and resources for various species to traverse the region. Fossil evidence confirms that this land connection allowed for the migration of plants and animals between the Old and New worlds. Additionally, it is widely believed that this route served as a primary path for humans migrating from Asia to populate the Americas. As glaciers eventually melted and sea levels rose, the land bridge was submerged, severing the connection.123