You chose the ancestor to the Echinodermata and Chordata

The main structural evidence that the Echinodermata and Chordata evolved from an ancestor that was not an ancestor to the other animals is that both are deuterostomes . This means that they have several unique developmental features (cl ick on any feature for an explanation of what it means):

1. The blastopore develops into the anus, not the mouth
2. Radial cleavage
3. Indeterminate cleavage
4. Enterocoelous development of the coelom

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