Final answer:
The Bering land bridge was formed during the last ice age and served as a migration route for humans and animals. Its existence led to the peopling of the Americas and brought new species to the region.
Step-by-step explanation:
The Bering land bridge was formed during the last ice age when sea levels dropped, exposing a section of low-lying land between modern Alaska and Russia known as Beringia. This land bridge served as a migration route for humans and animals. As the glaciers retreated and sea levels rose, the land bridge became submerged.
The existence of the Bering land bridge had several effects. It allowed for the migration of humans and animals from Asia to the Americas, which is believed to have led to the peopling of the Americas. This migration also brought new species of plants and animals to the Americas. Additionally, the formation of the land bridge and subsequent migration had cultural and environmental impacts on the indigenous populations that settled in the Americas.