It is believed that the two main reasons for mass extinctions in Earth's history have been

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The two main reasons for mass extinctions in Earth's history have been the impact of Earth with a large, celestial body (such as the asteroid that caused the extinction of the dinosaurs) and the shifting of Earth's continents (which can lead to changes in climate and environment). Human intervention and global warming are relatively recent factors that have contributed to extinction events but have not been the main reasons for mass extinctions throughout Earth's history.

It Is Believed That the Two Main Reasons for Mass