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The Paleozoic Era

https://ucmp.berkeley.edu/paleozoic/paleozoic.html

“The Paleozoic is bracketed by two of the most important events in the history of animal life. At its beginning, multicelled animals underwent a dramatic "explosion" in diversity, and almost all living animal phyla appeared within a few millions of years. At the other end of the Paleozoic, the...” (from the page’s text)

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