Answer:
Asia and North-America
Explanation:
The Bering strait is a portion of about 47 miles (75 km) that separates Asia (Russia) and North-America (state of Alaska, USA). Let's remember that Alaska belonged to Russia and was bought by the US.
That straight is a place with very harsh and extremely violent weather fueled by cold Arctic water and winds.
20,000 years ago, that straight was solid ice and that's how human migrated from Asia to North America (and went further South afterwards).
Constantine made Christianity the official religion of Rome
Mass extinctions occur for many reasons. Changes in the environment might make it impossible for the local life to survive, diesease or drought might strike, or there might be a natural disaster. These extinctions make good divisions in geologic time because they are easy to locate over a wide area and mark a definitive change in the Earth's systems.
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