The divergence of the common ancestor of animals into the protostome and deuterostome lineages occurred during the

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The divergence of the protostome and deuterostome lineages occurred during the Cambrian period, over 500 million years ago. The Cambrian period is known for the rapid diversification of animal life, including the emergence of the first bilateral animals, which gave rise to both protostomes and deuterostomes.

The Divergence of the Common Ancestor of Animals into the Protostome