Answer:
Before the ice ages, Earth's geography was significantly different, and land bridges played a crucial role in connecting continents and facilitating the migration of species. One of the most famous land bridges was Beringia, a vast expanse of land that connected present-day Siberia in Asia to Alaska in North America. During periods of lower sea levels, which occurred due to the extensive ice sheets, Beringia emerged, creating a bridge for both humans and animals. This land bridge allowed early humans to migrate from Asia into North America, contributing to the peopling of the Americas. Land bridges, like Beringia, played a vital role in shaping the distribution of species and human populations across continents during these prehistoric periods, influencing the course of ecological and human history.
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