Cambrian-explosion meaning

The rapid diversification of multicellular animal life around the beginning of the Cambrian Period, resulting in the appearance of almost all modern animal phyla.
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The rapid diversification of multicellular animal life that took place around the beginning of the Cambrian Period. It resulted in the appearance of almost all modern animal phyla.
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The relatively rapid appearance, around 542 million years ago, of most major animal phyla, as demonstrated in the fossil record.
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