Give an account of the different mass extinctions that occurred in geological time scale.

Throughout Earth's history, there have been five major mass extinctions, each marking significant changes in biodiversity and ecosystems. These extinctions occurred over millions of years and had profound impacts on life forms across the planet.

1. Ordovician-Silurian Extinction (around 445 million years ago): This was the second-largest mass ___ ____ _____ ______ ____.
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