Half a billion years ago, Earth hit its stride. After millions of years of slow going, evolutionarily speaking, the "Cambrian explosion" saw a rapid acceleration in the number of species evolving from existing life. Fossilized evidence from the era suggests that the Cambrian explosion is when the ancestors of most of the animals we know now came into being. Still, scientists have long theorized about what might have predated the Cambrian explosion.

 

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