What could have triggered mass extinctions of species in the past?

Question

Philoid · Accepted Answer

Some of the assumptions taken in consideration by scientists are:

A) Natural calamities like volcanic eruptions, flood, drought etc.

B) Due to change in temperature

C) Fall in sea level

D) Sudden movement of tectonic plates

E) Some asteroids hitted the planet which led to dust storm and earthquakes- it is also considered

as the major cause for the extinction of the dinosaurs.