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Living species of chordates are classified into three major subphyla: vertebrata, urochordata, and what?

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cephalochordata

Living species of chordates are classified into three major subphyla: Vertebrata, Urochordata, and Cephalochordata. Vertebrates are all chordates that have a backbone. The other two subphyla are invertebrate chordates that lack a backbone.

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