Henk Visscher Free People Check 

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Guardian: An ozone lesson from prehistory | Environment | The Guardian

An extra dose of UV light is most likely to have been responsible for wiping out many land plants during the earth's largest mass extinction.

Fungi helped destroy forests during mass extinction 250 million years...

news.berkeley.edu
... Henk Visscher of the Laboratory of Palaeobotany and Palynology at Utrecht University in the Netherlands and Mark Sephton of the Impacts and Astromaterials ...
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