Did the Cambrian explosion really happen?

Did the Cambrian explosion really happen?

A cursory flip through any high school biology textbook will inevitably surface a mention of the Cambrian explosion, a period about 540 million to 520 million years ago during which many animal groups first sprang into life and diversified. The event is frequently described as rapid and prolific, evoking a chaotic moment in early evolutionary history. 

But was there really a dramatic burst of biodiversity on Earth during this time? 

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