In protochordates the epidermis is

Options

A. Absent
B. Multilayered
C. A few layered
D. Single layered

Answer

**Step-by-Step Solution:**

1. **Understanding Protochordates**: Protochordates are organisms that belong to the phylum Chordata. They are characterized by certain features that are foundational to the development of more complex chordates.

2. **Examining the Epidermis**: The question asks about the nature of the epidermis in protochordates. The options provided are: absent, multilayered, few layered, and single layered.

3. **Identifying the Correct Option**:
- It is known that protochordates possess a single layer of epidermis.
- This epidermis is made up of long columnar cells.

4. **Special Characteristics**:
- In some protochordates, like Balanoglossus, the columnar cells of the epidermis can be ciliated.
- The endodermis, which is another layer of tissue, is absent in these organisms.

5. **Conclusion**: Based on the information, the correct answer to the question is that in protochordates, the epidermis is **single layered**.

**Final Answer**: The epidermis in protochordates is single layered.

---