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25 December, 14:06

What important event in animal evolution marks the beginning of the Cambrian period?

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  1. 25 December, 14:13
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    The event in animal evolution that marks the beginning of the Cambrian period is the evolution of chordates and arthropods. Chordates are animals with a dorsal nerve cord and arthropods are the ancestors of crustaceans and insects. Hope this answers the question.
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