EXTINCTION 101
Apr 14, 2022
0 minutes
![f0025-01](https://article-imgs.scribdassets.com/8qdgra0ji89q2g1t/images/fileFYNZE7D2.jpg)
1 ORDOVICIAN-SILURIAN EXTINCTION: ~ 440 MILLION YEARS AGO
oughly 85 per cent of all animal species on
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