Question

scientists consistently link two catastrophic events with the five major mass extinctions recorded throughout earths 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

Explanation:

Geoscience and paleontology research shows that the two most consistent catastrophic events tied to Earth's five major mass extinctions are asteroid impacts (like the one that killed non-avian dinosaurs) and large-scale volcanic eruptions (such as the Siberian Traps eruptions linked to the Permian-Triassic extinction). Other options do not represent the two primary, consistently linked catastrophic events.

Answer:

B. the impact of asteroids and volcanic eruptions.