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What is the major evolutionary advancement of the phylum chordata?

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Not all four characteristics of the phylum, I already know those. In other words, compared to the phylum before it (echinodermata), what makes choradata evolutionarily superior?
Update : Ah, superior wasn't the correct way to phrase it... sorry! I was ...show more
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There is nothing that makes chordata "evolutionary superior." That is a meaningless phrase. As the name suggests, the key trait unique to chordata is the notochord.

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What is the major evolutionary advancement of the phylum chordata?
Not all four characteristics of the phylum, I already know those. In other words, compared to the phylum before it (echinodermata), what makes choradata evolutionarily superior?
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