From PBS Eons.

The End-Ordovician Extinction was the first of the so-called ‘Big Five’ mass extinctions in the history of life on Earth – more than 80% of species in the oceans died out. But could you survive its aftermath?

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References:
https://docs.google.com/document/d/1e-eVIrT7XvnwV7VGjU4mW3hHb19RHgBlUXIJjD_QDuM/edit?usp=sharing