stomochord is found in

Options

A. Hemichordata
B. Cephalochordata
C. Urochordata
D. Both B and C

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Stomochord":**
- The stomochord is a tubular structure that is found in certain marine animals. It is important to know what organisms possess this structure.

2. **Identifying the Groups:**
- The question provides four options: Hemichordata, Cephalochordata, Urochordata, and both B and C. We need to analyze these groups to determine where the stomochord is found.

3. **Exploring Hemichordata:**
- Hemichordata is a separate phylum that includes marine deuterostome animals. In hemichordates, the stomochord is present as a tubular structure. It arises during embryonic development as an outpocketing from the roof of the embryonic gut, specifically located interior to the pharynx.

4. **Analyzing Cephalochordata and Urochordata:**
- Cephalochordata and Urochordata are subphyla of the phylum Chordata. In these groups, the stomochord is not present. Therefore, they cannot be the correct answers.

5. **Conclusion:**
- Since the stomochord is specifically found in Hemichordata and not in Cephalochordata or Urochordata, the correct answer to the question is Hemichordata.

**Final Answer:**
Stomochord is found in Hemichordata.

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