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A team of researchers from the University of Oxford, University of Leeds and UCL have found that extreme fluctuations in atmospheric oxygen levels corresponded with evolutionary surges and extinctions in animal biodiversity during the Cambrian explosion.

Fossilised arthropods from the Cambrian Period
Fossilised arthropods Phytophilaspis from the Cambrian Period. Credit: Andrey Zhuravlev, Lomonosov Moscow State University
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