In protochordates, the epidermis is

Absent

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Multilayered

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A few layered

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Single layered

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Solution

The correct option is D Single layered
Protochordata is included in the phylum Chordata. They possess a single layer of epidermis consisting of long columnar cells. In some cases such as Balanoglossus, these cells are ciliated. The lower layer dermis is absent in Protochordates. Thus, the correct answer is 'Single layered'.

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