.................. are included under protochordata.

Cephalochordata

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Urochordata

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Hemichordata

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All the the above

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Solution

The correct option is D All the the above
Protochordates are closely related to vertebrates. These lack some of the peculiar characteristics of chordates like the true skull, brain, skeleton. These are invertebrates. This group is composed of the phylum Hemichordata and the subphylum Urochordata and Cephalochordata.
So, the correct answer is option D.

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