Question

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.
B) the impact of asteroids and volcanic eruptions.
C) lack of atmospheric oxygen and volcanic eruptions.
D) global ice ages and the rise and fall of sea level.

Answer 1

The impact of asteroids and volcanic eruptions

Answer 2

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.