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At which of these era did the mass extinction in which trilobites and amphibians dissapeared occur?

by Guest60891  |  earlier

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Precambrian era, paleozoic era cambrian period or quaternary period?

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  1. At the  end of the Paleozoic.  More specifically, at the end of the Permian, which is the last period of the Paleozoic.


  2. Paleozoic era.
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