The answer to this question is D
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Answer: External segments are called metameres and internally, septa, or dividing walls, are located between the segments.
Explanation: I think it is
True, Chordates are animals in Phylum Chordata.Chordates include all of the vertebrates, in which the notochord develops into a backbone, as well as some invertebrates. Invertebrate chordates include tunicates and lancelets.