With respect to phylum Chordata, [[1]] show retrogressive metamorphosis.

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answer is UROCHORDATES.

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Detailed Solution

With respect to phylum Chordata, urochordates show retrogressive metamorphosis.

In retrogressive metamorphosis, the free-swimming larva possesses advanced characteristics that are lost during development and the adult is either sedentary or degenerated with primitive characteristics.

Retrogressive metamorphosis is a characteristic of Tunicates of Urochordata. Adult urochordates being sedentary show degenerative characters while the free-swimming tadpole larva shows advanced chordate characters which are lost during metamorphosis.

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