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Echinoderms proximal to chordates

Name the embryonic characteristic which evolutionarily forms echinoderms proximal to chordates?

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Chordates and Echinoderms are deuterostomes, that is, in their embryonic growth the blastopore turns into anus. All other animals with whole digestive system are protostomes, that is, their blastopore initiates the mouth.

The blastopore is the primary opening of digestive tube which appears in the embryonic growth.

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