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Scientists consistently link two catastrophic events with the five major mass extinctions recorded throughout Earth's history. These two events are

Aglobal ice ages and the impact of asteroids.
Bthe impact of asteroids and volcanic eruptions.
Clack of atmospheric oxygen and volcanic eruptions.
Dglobal ice ages and the rise and fall of sea level.

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Greenleafable

Scientists consistently link two catastrophic events with the five major mass extinctions recorded throughout Earth's history. These two events are
A) global ice ages and the impact of asteroids. 
Global ice ages led to the extinction of many populations over time, whereas when asteroids hit Earth, dinosaurs disappeared, among other species.

The impact of asteroids and volcanic eruptions

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