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Looking at the phylogenetic tree for animals, it appears that animals evolved bilateral symmetry around the same they evolved three tissue layers (triploblasty). Is there a reason why three tissue layers developed in around the same time bilateral symmetry developed?

Were these developments linked evolutionarily speaking?

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    $\begingroup$ Unfortunately, most evolutionary "reasons" are speculative at best, and when we go all the way back to the Cambrian there is little ability to get a meaningful answer to a question like this. $\endgroup$
    – jakebeal
    Oct 24 '21 at 1:02

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