Relationship in phylum echinoderms and phylum chordates

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Relationship in phylum echinoderms and phylum chordates

One of the most interesting concepts in animal evolution is the relationship between the phylum Echinoderms and the phylum Chordates. Humans belong to the phylum Chordata. The phylum most closely related to our phylum is the Echinoderms. Why? What features are shared among these two? What features are different?

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