What is the major evolutionary advancement of the phylum chordata?

Rebecca

New member
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?
Ah, superior wasn't the correct way to phrase it... sorry! I was pretty sure it was notochord, thanks! Any other answers would be greatly appreciated!
 
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