lethal pulse of ultraviolet (UV) radiation may have played a role in Earth’s biggest mass extinction event, revealed by fossilised pollen grains. Pollen that dates to the time of the Permian-Triassic mass extinction event, roughly 250 million years ago, produced ‘sunscreen’ compounds
Ultraviolet radiation played a role in a mass extinction event
Feb 16, 2023
1 minute
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